"no columns to parse from file" Code Answer's

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no columns to parse from file

Santino on Mar 13, 2021

Using try and except just lets you continue in spite of errors and handle them. It won't magically fix your errors.

read_csv expects csv files, which your input is obviously not. A quick look into the documentation:

delim_whitespace : boolean, default False

Specifies whether or not whitespace (e.g. ' ' or ' ') will be used as the sep. Equivalent to setting sep='+s'. If this option is set to True, nothing should be passed in for the delimiter parameter.

This seems like the right argument. Use

pandas.read_csv(filepath_or_buffer, delim_whitespace=True).
Using delimiter='\t' should also work, unless the tabs are expanded (replaced by spaces). As we can't really tell, delim_whitespace seems to be the better option.

If this doesn't help, just print out your sys.stdin to check if you properly pass the text.

Edit: I just saw that you use

cat /root/lab/u.data | python /root/lab/mid-1-mapper.py |python /root/lab/mid-1-reducer.py
Is this intended, this way mid-1-reducer.py processes the output of mid-1-mapper.py. If you want to process the content of the file u.data consider reading the file and not sys.stdin.

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"no columns to parse from file" Code Answer's