Pandas: read_csv indicating 'space-delimited'

问题

I have the following file.txt (abridged):

SICcode        Catcode        Category                              SICname        MultSIC
0111        A1500        Wheat, corn, soybeans and cash grain        Wheat        X
0112        A1600        Other commodities (incl rice, peanuts)      Rice        X
0115        A1500        Wheat, corn, soybeans and cash grain        Corn        X
0116        A1500        Wheat, corn, soybeans and cash grain        Soybeans        X
0119        A1500        Wheat, corn, soybeans and cash grain        Cash grains, NEC        X
0131        A1100        Cotton        Cotton        X
0132        A1300        Tobacco & Tobacco products                  Tobacco        X

I'm having some problems reading it into a pandas df. I tried pd.read_csvwith the following specifications engine='python', sep='Tab'but it returned the file in one column:

    SICcode Catcode Category SICname MultSIC
0   0111 A1500 Wheat, corn, soybeans...
1   0112 A1600 Other commodities (in...
2   0115 A1500 Wheat, corn, soybeans...
3   0116 A1500 Wheat, corn, soybeans...

Then I tried to put it into a gnumeric file using 'tab' as a delimiter, but it read the file as one column. Does anyone have an idea on this?

回答1:

If df = pd.read_csv('file.txt', sep='\t') returns a DataFrame with one column, then apparently file.txt is not using tabs as separators. Your data might simply have spaces as separators. In that case you could try

df = pd.read_csv('data', sep=r'\s{2,}')

which uses the regex pattern \s{2,} as the separator. This regex matches 2-or-more whitespace characters.

In [8]: df
Out[8]: 
   SICcode Catcode                                Category           SICname  \
0      111   A1500    Wheat, corn, soybeans and cash grain             Wheat   
1      112   A1600  Other commodities (incl rice, peanuts)              Rice   
2      115   A1500    Wheat, corn, soybeans and cash grain              Corn   
3      116   A1500    Wheat, corn, soybeans and cash grain          Soybeans   
4      119   A1500    Wheat, corn, soybeans and cash grain  Cash grains, NEC   
5      131   A1100                                  Cotton            Cotton   
6      132   A1300              Tobacco & Tobacco products           Tobacco   

  MultSIC  
0       X  
1       X  
2       X  
3       X  
4       X  
5       X  
6       X

If this does not work, please post print(repr(open(file.txt, 'rb').read(100)). This will show us an unambiguous representation of the first 100 bytes of file.txt.

回答2:

I think you can try add sep="\t" to read_csv if data in csv are separated by Tabulator.

import pandas as pd

df = pd.read_csv('test/a.csv', sep="\t")
print df
   SICcode Catcode                               Category           SICname  \
0      111   A1500   Wheat, corn, soybeans and cash grain             Wheat   
1      112   A1600  ther commodities (incl rice, peanuts)              Rice   
2      115   A1500   Wheat, corn, soybeans and cash grain              Corn   
3      116   A1500   Wheat, corn, soybeans and cash grain          Soybeans   
4      119   A1500   Wheat, corn, soybeans and cash grain  Cash grains, NEC   
5      131   A1100                                 Cotton            Cotton   
6      132   A1300             Tobacco & Tobacco products           Tobacco   

  MultSIC  
0       X  
1       X  
2       X  
3       X  
4       X  
5       X  
6       X

来源：https://stackoverflow.com/questions/36790948/pandas-read-csv-indicating-space-delimited

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