知识问答

从嵌套列表创建数组时，请抑制Numpy中的科学计数法

内容 隐藏
问题：从嵌套列表创建数组时，请抑制Numpy中的科学计数法
回答 0
回答 1
在打印numpy ndarray，纠缠文本对齐方式，舍入和打印选项时，Python强制抑制所有指数符号：
完整的示例演示1：
完整的示例演示2：
Python Force-suppress all exponential notation when printing numpy ndarrays, wrangle text justification, rounding and print options:
Full example Demo 1:
Full example Demo 2:
回答 2
回答 3

问题：从嵌套列表创建数组时，请抑制Numpy中的科学计数法

我有一个嵌套的Python列表，如下所示：

my_list = [[3.74, 5162, 13683628846.64, 12783387559.86, 1.81],
 [9.55, 116, 189688622.37, 260332262.0, 1.97],
 [2.2, 768, 6004865.13, 5759960.98, 1.21],
 [3.74, 4062, 3263822121.39, 3066869087.9, 1.93],
 [1.91, 474, 44555062.72, 44555062.72, 0.41],
 [5.8, 5006, 8254968918.1, 7446788272.74, 3.25],
 [4.5, 7887, 30078971595.46, 27814989471.31, 2.18],
 [7.03, 116, 66252511.46, 81109291.0, 1.56],
 [6.52, 116, 47674230.76, 57686991.0, 1.43],
 [1.85, 623, 3002631.96, 2899484.08, 0.64],
 [13.76, 1227, 1737874137.5, 1446511574.32, 4.32],
 [13.76, 1227, 1737874137.5, 1446511574.32, 4.32]]

然后导入Numpy，并将打印选项设置为(suppress=True)。创建数组时：

my_array = numpy.array(my_list)

我无法一生压制科学记法：

[[  3.74000000e+00   5.16200000e+03   1.36836288e+10   1.27833876e+10
    1.81000000e+00]
 [  9.55000000e+00   1.16000000e+02   1.89688622e+08   2.60332262e+08
    1.97000000e+00]
 [  2.20000000e+00   7.68000000e+02   6.00486513e+06   5.75996098e+06
    1.21000000e+00]
 [  3.74000000e+00   4.06200000e+03   3.26382212e+09   3.06686909e+09
    1.93000000e+00]
 [  1.91000000e+00   4.74000000e+02   4.45550627e+07   4.45550627e+07
    4.10000000e-01]
 [  5.80000000e+00   5.00600000e+03   8.25496892e+09   7.44678827e+09
    3.25000000e+00]
 [  4.50000000e+00   7.88700000e+03   3.00789716e+10   2.78149895e+10
    2.18000000e+00]
 [  7.03000000e+00   1.16000000e+02   6.62525115e+07   8.11092910e+07
    1.56000000e+00]
 [  6.52000000e+00   1.16000000e+02   4.76742308e+07   5.76869910e+07
    1.43000000e+00]
 [  1.85000000e+00   6.23000000e+02   3.00263196e+06   2.89948408e+06
    6.40000000e-01]
 [  1.37600000e+01   1.22700000e+03   1.73787414e+09   1.44651157e+09
    4.32000000e+00]
 [  1.37600000e+01   1.22700000e+03   1.73787414e+09   1.44651157e+09
    4.32000000e+00]]

如果我直接创建一个简单的numpy数组：

new_array = numpy.array([1.5, 4.65, 7.845])

我没有问题，它显示如下：

[ 1.5    4.65   7.845]

有人知道我的问题是什么吗？

点击查看英文原文

I have a nested Python list that looks like the following:

my_list = [[3.74, 5162, 13683628846.64, 12783387559.86, 1.81],
 [9.55, 116, 189688622.37, 260332262.0, 1.97],
 [2.2, 768, 6004865.13, 5759960.98, 1.21],
 [3.74, 4062, 3263822121.39, 3066869087.9, 1.93],
 [1.91, 474, 44555062.72, 44555062.72, 0.41],
 [5.8, 5006, 8254968918.1, 7446788272.74, 3.25],
 [4.5, 7887, 30078971595.46, 27814989471.31, 2.18],
 [7.03, 116, 66252511.46, 81109291.0, 1.56],
 [6.52, 116, 47674230.76, 57686991.0, 1.43],
 [1.85, 623, 3002631.96, 2899484.08, 0.64],
 [13.76, 1227, 1737874137.5, 1446511574.32, 4.32],
 [13.76, 1227, 1737874137.5, 1446511574.32, 4.32]]

I then import Numpy, and set print options to (suppress=True). When I create an array:

my_array = numpy.array(my_list)

I can’t for the life of me suppress scientific notation:

[[  3.74000000e+00   5.16200000e+03   1.36836288e+10   1.27833876e+10
    1.81000000e+00]
 [  9.55000000e+00   1.16000000e+02   1.89688622e+08   2.60332262e+08
    1.97000000e+00]
 [  2.20000000e+00   7.68000000e+02   6.00486513e+06   5.75996098e+06
    1.21000000e+00]
 [  3.74000000e+00   4.06200000e+03   3.26382212e+09   3.06686909e+09
    1.93000000e+00]
 [  1.91000000e+00   4.74000000e+02   4.45550627e+07   4.45550627e+07
    4.10000000e-01]
 [  5.80000000e+00   5.00600000e+03   8.25496892e+09   7.44678827e+09
    3.25000000e+00]
 [  4.50000000e+00   7.88700000e+03   3.00789716e+10   2.78149895e+10
    2.18000000e+00]
 [  7.03000000e+00   1.16000000e+02   6.62525115e+07   8.11092910e+07
    1.56000000e+00]
 [  6.52000000e+00   1.16000000e+02   4.76742308e+07   5.76869910e+07
    1.43000000e+00]
 [  1.85000000e+00   6.23000000e+02   3.00263196e+06   2.89948408e+06
    6.40000000e-01]
 [  1.37600000e+01   1.22700000e+03   1.73787414e+09   1.44651157e+09
    4.32000000e+00]
 [  1.37600000e+01   1.22700000e+03   1.73787414e+09   1.44651157e+09
    4.32000000e+00]]

If I create a simple numpy array directly:

new_array = numpy.array([1.5, 4.65, 7.845])

I have no problem and it prints as follows:

[ 1.5    4.65   7.845]

Does anyone know what my problem is?

回答 0

我想您需要的是np.set_printoptions(suppress=True)，有关详细信息，请参见此处：http : //pythonquirks.blogspot.fr/2009/10/controlling-printing-in-numpy.html

有关SciPy.org numpy文档，其中包括所有功能参数（以上链接未详细介绍抑制功能），请参见此处：https : //docs.scipy.org/doc/numpy/reference/generation/numpy.set_printoptions.html

点击查看英文原文

I guess what you need is np.set_printoptions(suppress=True), for details see here: http://pythonquirks.blogspot.fr/2009/10/controlling-printing-in-numpy.html

For SciPy.org numpy documentation, which includes all function parameters (suppress isn’t detailed in the above link), see here: https://docs.scipy.org/doc/numpy/reference/generated/numpy.set_printoptions.html

回答 1

在打印numpy ndarray，纠缠文本对齐方式，舍入和打印选项时，Python强制抑制所有指数符号：

接下来是发生的情况的说明，滚动至底部以获取代码演示。

将参数传递suppress=True给函数set_printoptions仅适用于分配给它的默认8个字符空间的数字，如下所示：

import numpy as np
np.set_printoptions(suppress=True) #prevent numpy exponential 
                                   #notation on print, default False

#            tiny     med  large
a = np.array([1.01e-5, 22, 1.2345678e7])  #notice how index 2 is 8 
                                          #digits wide

print(a)    #prints [ 0.0000101   22.     12345678. ]

但是，如果您输入的数字的宽度大于8个字符，则会再次采用指数表示法，如下所示：

np.set_printoptions(suppress=True)

a = np.array([1.01e-5, 22, 1.2345678e10])    #notice how index 2 is 10
                                             #digits wide, too wide!

#exponential notation where we've told it not to!
print(a)    #prints [1.01000000e-005   2.20000000e+001   1.23456780e+10]

numpy可以选择将您的数字切成两半，然后再用错误的数字表示，或者强制采用指数表示法，然后选择后者。

这是set_printoptions(formatter=...)为了指定打印和取整选项而进行的工作。告诉set_printoptions只打印一个浮点数：

np.set_printoptions(suppress=True,
   formatter={'float_kind':'{:f}'.format})

a = np.array([1.01e-5, 22, 1.2345678e30])  #notice how index 2 is 30
                                           #digits wide.  

#Ok good, no exponential notation in the large numbers:
print(a)  #prints [0.000010 22.000000 1234567799999999979944197226496.000000]

我们已经强制抑制了指数符号，但是它不是四舍五入的，因此请指定其他格式选项：

np.set_printoptions(suppress=True,
   formatter={'float_kind':'{:0.2f}'.format})  #float, 2 units 
                                               #precision right, 0 on left

a = np.array([1.01e-5, 22, 1.2345678e30])   #notice how index 2 is 30
                                            #digits wide

print(a)  #prints [0.00 22.00 1234567799999999979944197226496.00]

强制抑制ndarray中所有指数概念的缺点是，如果您的ndarray在其中的无穷大附近获得巨大的float值，并且进行打印，您将被满是数字的页面炸掉。

完整的示例演示1：

from pprint import pprint
import numpy as np
#chaotic python list of lists with very different numeric magnitudes
my_list = [[3.74, 5162, 13683628846.64, 12783387559.86, 1.81],
           [9.55, 116, 189688622.37, 260332262.0, 1.97],
           [2.2, 768, 6004865.13, 5759960.98, 1.21],
           [3.74, 4062, 3263822121.39, 3066869087.9, 1.93],
           [1.91, 474, 44555062.72, 44555062.72, 0.41],
           [5.8, 5006, 8254968918.1, 7446788272.74, 3.25],
           [4.5, 7887, 30078971595.46, 27814989471.31, 2.18],
           [7.03, 116, 66252511.46, 81109291.0, 1.56],
           [6.52, 116, 47674230.76, 57686991.0, 1.43],
           [1.85, 623, 3002631.96, 2899484.08, 0.64],
           [13.76, 1227, 1737874137.5, 1446511574.32, 4.32],
           [13.76, 1227, 1737874137.5, 1446511574.32, 4.32]]

#convert python list of lists to numpy ndarray called my_array
my_array = np.array(my_list)

#This is a little recursive helper function converts all nested 
#ndarrays to python list of lists so that pretty printer knows what to do.
def arrayToList(arr):
    if type(arr) == type(np.array):
        #If the passed type is an ndarray then convert it to a list and
        #recursively convert all nested types
        return arrayToList(arr.tolist())
    else:
        #if item isn't an ndarray leave it as is.
        return arr

#suppress exponential notation, define an appropriate float formatter
#specify stdout line width and let pretty print do the work
np.set_printoptions(suppress=True,
   formatter={'float_kind':'{:16.3f}'.format}, linewidth=130)
pprint(arrayToList(my_array))

印刷品： 

array([[           3.740,         5162.000,  13683628846.640,  12783387559.860,            1.810],
       [           9.550,          116.000,    189688622.370,    260332262.000,            1.970],
       [           2.200,          768.000,      6004865.130,      5759960.980,            1.210],
       [           3.740,         4062.000,   3263822121.390,   3066869087.900,            1.930],
       [           1.910,          474.000,     44555062.720,     44555062.720,            0.410],
       [           5.800,         5006.000,   8254968918.100,   7446788272.740,            3.250],
       [           4.500,         7887.000,  30078971595.460,  27814989471.310,            2.180],
       [           7.030,          116.000,     66252511.460,     81109291.000,            1.560],
       [           6.520,          116.000,     47674230.760,     57686991.000,            1.430],
       [           1.850,          623.000,      3002631.960,      2899484.080,            0.640],
       [          13.760,         1227.000,   1737874137.500,   1446511574.320,            4.320],
       [          13.760,         1227.000,   1737874137.500,   1446511574.320,            4.320]])

完整的示例演示2：

import numpy as np  
#chaotic python list of lists with very different numeric magnitudes 

#            very tiny      medium size            large sized
#            numbers        numbers                numbers

my_list = [[0.000000000074, 5162, 13683628846.64, 1.01e10, 1.81], 
           [1.000000000055,  116, 189688622.37, 260332262.0, 1.97], 
           [0.010000000022,  768, 6004865.13,   -99e13, 1.21], 
           [1.000000000074, 4062, 3263822121.39, 3066869087.9, 1.93], 
           [2.91,            474, 44555062.72, 44555062.72, 0.41], 
           [5,              5006, 8254968918.1, 7446788272.74, 3.25], 
           [0.01,           7887, 30078971595.46, 27814989471.31, 2.18], 
           [7.03,            116, 66252511.46, 81109291.0, 1.56], 
           [6.52,            116, 47674230.76, 57686991.0, 1.43], 
           [1.85,            623, 3002631.96, 2899484.08, 0.64], 
           [13.76,          1227, 1737874137.5, 1446511574.32, 4.32], 
           [13.76,          1337, 1737874137.5, 1446511574.32, 4.32]] 
import sys 
#convert python list of lists to numpy ndarray called my_array 
my_array = np.array(my_list) 
#following two lines do the same thing, showing that np.savetxt can 
#correctly handle python lists of lists and numpy 2D ndarrays. 
np.savetxt(sys.stdout, my_list, '%19.2f') 
np.savetxt(sys.stdout, my_array, '%19.2f')

印刷品： 

 0.00             5162.00      13683628846.64      10100000000.00              1.81
 1.00              116.00        189688622.37        260332262.00              1.97
 0.01              768.00          6004865.13 -990000000000000.00              1.21
 1.00             4062.00       3263822121.39       3066869087.90              1.93
 2.91              474.00         44555062.72         44555062.72              0.41
 5.00             5006.00       8254968918.10       7446788272.74              3.25
 0.01             7887.00      30078971595.46      27814989471.31              2.18
 7.03              116.00         66252511.46         81109291.00              1.56
 6.52              116.00         47674230.76         57686991.00              1.43
 1.85              623.00          3002631.96          2899484.08              0.64
13.76             1227.00       1737874137.50       1446511574.32              4.32
13.76             1337.00       1737874137.50       1446511574.32              4.32
 0.00             5162.00      13683628846.64      10100000000.00              1.81
 1.00              116.00        189688622.37        260332262.00              1.97
 0.01              768.00          6004865.13 -990000000000000.00              1.21
 1.00             4062.00       3263822121.39       3066869087.90              1.93
 2.91              474.00         44555062.72         44555062.72              0.41
 5.00             5006.00       8254968918.10       7446788272.74              3.25
 0.01             7887.00      30078971595.46      27814989471.31              2.18
 7.03              116.00         66252511.46         81109291.00              1.56
 6.52              116.00         47674230.76         57686991.00              1.43
 1.85              623.00          3002631.96          2899484.08              0.64
13.76             1227.00       1737874137.50       1446511574.32              4.32
13.76             1337.00       1737874137.50       1446511574.32              4.32

请注意，舍入在2个单位的精度上是一致的，并且在非常大e+x和非常小的e-x范围内，指数符号都被抑制。

点击查看英文原文

Python Force-suppress all exponential notation when printing numpy ndarrays, wrangle text justification, rounding and print options:

What follows is an explanation for what is going on, scroll to bottom for code demos.

Passing parameter suppress=True to function set_printoptions works only for numbers that fit in the default 8 character space allotted to it, like this:

import numpy as np
np.set_printoptions(suppress=True) #prevent numpy exponential 
                                   #notation on print, default False

#            tiny     med  large
a = np.array([1.01e-5, 22, 1.2345678e7])  #notice how index 2 is 8 
                                          #digits wide

print(a)    #prints [ 0.0000101   22.     12345678. ]

However if you pass in a number greater than 8 characters wide, exponential notation is imposed again, like this:

np.set_printoptions(suppress=True)

a = np.array([1.01e-5, 22, 1.2345678e10])    #notice how index 2 is 10
                                             #digits wide, too wide!

#exponential notation where we've told it not to!
print(a)    #prints [1.01000000e-005   2.20000000e+001   1.23456780e+10]

numpy has a choice between chopping your number in half thus misrepresenting it, or forcing exponential notation, it chooses the latter.

Here comes set_printoptions(formatter=...) to the rescue to specify options for printing and rounding. Tell set_printoptions to just print bare a bare float:

np.set_printoptions(suppress=True,
   formatter={'float_kind':'{:f}'.format})

a = np.array([1.01e-5, 22, 1.2345678e30])  #notice how index 2 is 30
                                           #digits wide.  

#Ok good, no exponential notation in the large numbers:
print(a)  #prints [0.000010 22.000000 1234567799999999979944197226496.000000]

We’ve force-suppressed the exponential notation, but it is not rounded or justified, so specify extra formatting options:

np.set_printoptions(suppress=True,
   formatter={'float_kind':'{:0.2f}'.format})  #float, 2 units 
                                               #precision right, 0 on left

a = np.array([1.01e-5, 22, 1.2345678e30])   #notice how index 2 is 30
                                            #digits wide

print(a)  #prints [0.00 22.00 1234567799999999979944197226496.00]

The drawback for force-suppressing all exponential notion in ndarrays is that if your ndarray gets a huge float value near infinity in it, and you print it, you’re going to get blasted in the face with a page full of numbers.

Full example Demo 1:

from pprint import pprint
import numpy as np
#chaotic python list of lists with very different numeric magnitudes
my_list = [[3.74, 5162, 13683628846.64, 12783387559.86, 1.81],
           [9.55, 116, 189688622.37, 260332262.0, 1.97],
           [2.2, 768, 6004865.13, 5759960.98, 1.21],
           [3.74, 4062, 3263822121.39, 3066869087.9, 1.93],
           [1.91, 474, 44555062.72, 44555062.72, 0.41],
           [5.8, 5006, 8254968918.1, 7446788272.74, 3.25],
           [4.5, 7887, 30078971595.46, 27814989471.31, 2.18],
           [7.03, 116, 66252511.46, 81109291.0, 1.56],
           [6.52, 116, 47674230.76, 57686991.0, 1.43],
           [1.85, 623, 3002631.96, 2899484.08, 0.64],
           [13.76, 1227, 1737874137.5, 1446511574.32, 4.32],
           [13.76, 1227, 1737874137.5, 1446511574.32, 4.32]]

#convert python list of lists to numpy ndarray called my_array
my_array = np.array(my_list)

#This is a little recursive helper function converts all nested 
#ndarrays to python list of lists so that pretty printer knows what to do.
def arrayToList(arr):
    if type(arr) == type(np.array):
        #If the passed type is an ndarray then convert it to a list and
        #recursively convert all nested types
        return arrayToList(arr.tolist())
    else:
        #if item isn't an ndarray leave it as is.
        return arr

#suppress exponential notation, define an appropriate float formatter
#specify stdout line width and let pretty print do the work
np.set_printoptions(suppress=True,
   formatter={'float_kind':'{:16.3f}'.format}, linewidth=130)
pprint(arrayToList(my_array))

Prints: 

array([[           3.740,         5162.000,  13683628846.640,  12783387559.860,            1.810],
       [           9.550,          116.000,    189688622.370,    260332262.000,            1.970],
       [           2.200,          768.000,      6004865.130,      5759960.980,            1.210],
       [           3.740,         4062.000,   3263822121.390,   3066869087.900,            1.930],
       [           1.910,          474.000,     44555062.720,     44555062.720,            0.410],
       [           5.800,         5006.000,   8254968918.100,   7446788272.740,            3.250],
       [           4.500,         7887.000,  30078971595.460,  27814989471.310,            2.180],
       [           7.030,          116.000,     66252511.460,     81109291.000,            1.560],
       [           6.520,          116.000,     47674230.760,     57686991.000,            1.430],
       [           1.850,          623.000,      3002631.960,      2899484.080,            0.640],
       [          13.760,         1227.000,   1737874137.500,   1446511574.320,            4.320],
       [          13.760,         1227.000,   1737874137.500,   1446511574.320,            4.320]])

Full example Demo 2:

import numpy as np  
#chaotic python list of lists with very different numeric magnitudes 

#            very tiny      medium size            large sized
#            numbers        numbers                numbers

my_list = [[0.000000000074, 5162, 13683628846.64, 1.01e10, 1.81], 
           [1.000000000055,  116, 189688622.37, 260332262.0, 1.97], 
           [0.010000000022,  768, 6004865.13,   -99e13, 1.21], 
           [1.000000000074, 4062, 3263822121.39, 3066869087.9, 1.93], 
           [2.91,            474, 44555062.72, 44555062.72, 0.41], 
           [5,              5006, 8254968918.1, 7446788272.74, 3.25], 
           [0.01,           7887, 30078971595.46, 27814989471.31, 2.18], 
           [7.03,            116, 66252511.46, 81109291.0, 1.56], 
           [6.52,            116, 47674230.76, 57686991.0, 1.43], 
           [1.85,            623, 3002631.96, 2899484.08, 0.64], 
           [13.76,          1227, 1737874137.5, 1446511574.32, 4.32], 
           [13.76,          1337, 1737874137.5, 1446511574.32, 4.32]] 
import sys 
#convert python list of lists to numpy ndarray called my_array 
my_array = np.array(my_list) 
#following two lines do the same thing, showing that np.savetxt can 
#correctly handle python lists of lists and numpy 2D ndarrays. 
np.savetxt(sys.stdout, my_list, '%19.2f') 
np.savetxt(sys.stdout, my_array, '%19.2f')

Prints: 

 0.00             5162.00      13683628846.64      10100000000.00              1.81
 1.00              116.00        189688622.37        260332262.00              1.97
 0.01              768.00          6004865.13 -990000000000000.00              1.21
 1.00             4062.00       3263822121.39       3066869087.90              1.93
 2.91              474.00         44555062.72         44555062.72              0.41
 5.00             5006.00       8254968918.10       7446788272.74              3.25
 0.01             7887.00      30078971595.46      27814989471.31              2.18
 7.03              116.00         66252511.46         81109291.00              1.56
 6.52              116.00         47674230.76         57686991.00              1.43
 1.85              623.00          3002631.96          2899484.08              0.64
13.76             1227.00       1737874137.50       1446511574.32              4.32
13.76             1337.00       1737874137.50       1446511574.32              4.32
 0.00             5162.00      13683628846.64      10100000000.00              1.81
 1.00              116.00        189688622.37        260332262.00              1.97
 0.01              768.00          6004865.13 -990000000000000.00              1.21
 1.00             4062.00       3263822121.39       3066869087.90              1.93
 2.91              474.00         44555062.72         44555062.72              0.41
 5.00             5006.00       8254968918.10       7446788272.74              3.25
 0.01             7887.00      30078971595.46      27814989471.31              2.18
 7.03              116.00         66252511.46         81109291.00              1.56
 6.52              116.00         47674230.76         57686991.00              1.43
 1.85              623.00          3002631.96          2899484.08              0.64
13.76             1227.00       1737874137.50       1446511574.32              4.32
13.76             1337.00       1737874137.50       1446511574.32              4.32

Notice that rounding is consistent at 2 units precision, and exponential notation is suppressed in both the very large e+x and very small e-x ranges.

回答 2

对于一维和二维数组，可以使用np.savetxt使用特定格式的字符串进行打印：

>>> import sys
>>> x = numpy.arange(20).reshape((4,5))
>>> numpy.savetxt(sys.stdout, x, '%5.2f')
 0.00  1.00  2.00  3.00  4.00
 5.00  6.00  7.00  8.00  9.00
10.00 11.00 12.00 13.00 14.00
15.00 16.00 17.00 18.00 19.00

在v1.3中使用numpy.set_printoptions或numpy.array2string的选项非常笨拙且受限制（例如，没有办法抑制大数的科学计数法）。看起来这将在将来的版本中发生变化，使用numpy.set_printoptions（formatter = ..）和numpy.array2string（style = ..）。

点击查看英文原文

for 1D and 2D arrays you can use np.savetxt to print using a specific format string:

>>> import sys
>>> x = numpy.arange(20).reshape((4,5))
>>> numpy.savetxt(sys.stdout, x, '%5.2f')
 0.00  1.00  2.00  3.00  4.00
 5.00  6.00  7.00  8.00  9.00
10.00 11.00 12.00 13.00 14.00
15.00 16.00 17.00 18.00 19.00

Your options with numpy.set_printoptions or numpy.array2string in v1.3 are pretty clunky and limited (for example no way to suppress scientific notation for large numbers). It looks like this will change with future versions, with numpy.set_printoptions(formatter=..) and numpy.array2string(style=..).

回答 3

您可以编写将科学计数法转换为常规计数的函数，例如

def sc2std(x):
    s = str(x)
    if 'e' in s:
        num,ex = s.split('e')
        if '-' in num:
            negprefix = '-'
        else:
            negprefix = ''
        num = num.replace('-','')
        if '.' in num:
            dotlocation = num.index('.')
        else:
            dotlocation = len(num)
        newdotlocation = dotlocation + int(ex)
        num = num.replace('.','')
        if (newdotlocation < 1):
            return negprefix+'0.'+'0'*(-newdotlocation)+num
        if (newdotlocation > len(num)):
            return negprefix+ num + '0'*(newdotlocation - len(num))+'.0'
        return negprefix + num[:newdotlocation] + '.' + num[newdotlocation:]
    else:
        return s
点击查看英文原文

You could write a function that converts a scientific notation to regular, something like

def sc2std(x):
    s = str(x)
    if 'e' in s:
        num,ex = s.split('e')
        if '-' in num:
            negprefix = '-'
        else:
            negprefix = ''
        num = num.replace('-','')
        if '.' in num:
            dotlocation = num.index('.')
        else:
            dotlocation = len(num)
        newdotlocation = dotlocation + int(ex)
        num = num.replace('.','')
        if (newdotlocation < 1):
            return negprefix+'0.'+'0'*(-newdotlocation)+num
        if (newdotlocation > len(num)):
            return negprefix+ num + '0'*(newdotlocation - len(num))+'.0'
        return negprefix + num[:newdotlocation] + '.' + num[newdotlocation:]
    else:
        return s