Python 实用宝典

Question 1

I’m trying to unzip a csv file and pass it into pandas so I can work on the file.
The code I have tried so far is:

import requests, zipfile, StringIO
r = requests.get('http://data.octo.dc.gov/feeds/crime_incidents/archive/crime_incidents_2013_CSV.zip')
z = zipfile.ZipFile(StringIO.StringIO(r.content))
crime2013 = pandas.read_csv(z.read('crime_incidents_2013_CSV.csv'))

After the last line, although python is able to get the file, I get a “does not exist” at the end of the error.

Can someone tell me what I’m doing incorrectly?

Question 2

If you want to read a zipped or a tar.gz file into pandas dataframe, the read_csv methods includes this particular implementation.

df = pd.read_csv('filename.zip')

Or the long form:

df = pd.read_csv('filename.zip', compression='zip', header=0, sep=',', quotechar='"')

Description of the compression argument from the docs:

compression : {‘infer’, ‘gzip’, ‘bz2’, ‘zip’, ‘xz’, None}, default ‘infer’ For on-the-fly decompression of on-disk data. If ‘infer’ and filepath_or_buffer is path-like, then detect compression from the following extensions: ‘.gz’, ‘.bz2’, ‘.zip’, or ‘.xz’ (otherwise no decompression). If using ‘zip’, the ZIP file must contain only one data file to be read in. Set to None for no decompression.

New in version 0.18.1: support for ‘zip’ and ‘xz’ compression.

Question 3

I think you want to open the ZipFile, which returns a file-like object, rather than read:

In [11]: crime2013 = pd.read_csv(z.open('crime_incidents_2013_CSV.csv'))

In [12]: crime2013
Out[12]:
<class 'pandas.core.frame.DataFrame'>
Int64Index: 24567 entries, 0 to 24566
Data columns (total 15 columns):
CCN                            24567  non-null values
REPORTDATETIME                 24567  non-null values
SHIFT                          24567  non-null values
OFFENSE                        24567  non-null values
METHOD                         24567  non-null values
LASTMODIFIEDDATE               24567  non-null values
BLOCKSITEADDRESS               24567  non-null values
BLOCKXCOORD                    24567  non-null values
BLOCKYCOORD                    24567  non-null values
WARD                           24563  non-null values
ANC                            24567  non-null values
DISTRICT                       24567  non-null values
PSA                            24567  non-null values
NEIGHBORHOODCLUSTER            24263  non-null values
BUSINESSIMPROVEMENTDISTRICT    3613  non-null values
dtypes: float64(4), int64(1), object(10)

Question 4

It seems you don’t even have to specify the compression any more. The following snippet loads the data from filename.zip into df.

import pandas as pd
df = pd.read_csv('filename.zip')

(Of course you will need to specify separator, header, etc. if they are different from the defaults.)

Question 5

For “zip” files, you can use import zipfile and your code will be working simply with these lines:

import zipfile
import pandas as pd
with zipfile.ZipFile("Crime_Incidents_in_2013.zip") as z:
   with z.open("Crime_Incidents_in_2013.csv") as f:
      train = pd.read_csv(f, header=0, delimiter="\t")
      print(train.head())    # print the first 5 rows

And the result will be:

X,Y,CCN,REPORT_DAT,SHIFT,METHOD,OFFENSE,BLOCK,XBLOCK,YBLOCK,WARD,ANC,DISTRICT,PSA,NEIGHBORHOOD_CLUSTER,BLOCK_GROUP,CENSUS_TRACT,VOTING_PRECINCT,XCOORD,YCOORD,LATITUDE,LONGITUDE,BID,START_DATE,END_DATE,OBJECTID
0  -77.054968548763071,38.899775938598317,0925135...                                                                                                                                                               
1  -76.967309569035052,38.872119553647011,1003352...                                                                                                                                                               
2  -76.996184958456539,38.927921847721443,1101010...                                                                                                                                                               
3  -76.943077541353617,38.883686046653935,1104551...                                                                                                                                                               
4  -76.939209158039446,38.892278093281632,1125028...

Question 6

https://www.kaggle.com/jboysen/quick-gz-pandas-tutorial

Please follow this link.

import pandas as pd
traffic_station_df = pd.read_csv('C:\\Folders\\Jupiter_Feed.txt.gz', compression='gzip',
                                 header=1, sep='\t', quotechar='"')

#traffic_station_df['Address'] = 'address'

#traffic_station_df.append(traffic_station_df)
print(traffic_station_df)

Python 实用宝典

读取压缩文件作为Pandas DataFrame

问题：读取压缩文件作为Pandas DataFrame

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