mannu jha wrote:
Hi,
I have few files like this:
file1:
22 110.1
33 331.5 22.7
5 271.9 17.2 33.4
4 55.1
file1 has total 4 column but some of them are missing in few row.
file2:
5 H
22 0
file3:
4 T
5 B
22 C
121 S
in all these files first column is the main source of matching their entries.
So What I want in the output is only those entries which is coming in all three
files.
output required:
5 271.9 17.2 33.4 5 H 5 T
22 110.1 22 0 22 C
Do you have a spec? Have you added any code to the last assignment to
deal with this question, and in what way isn't it working? Why don't
you post your code?
Generally, you seem to have lines where the first "word" is a key to the
line. The word appears to be distinguished by whitespace. So finding
the key from a line would be just line.split()[0] Then you build a
dictionary from each file. You didn't specify whether a given file
might have multiple lines with the same key, so I'll just say to watch
out for that, as a dictionary will cheerfully overwrite entries with new
ones.
Since your rule on multiple files is apparently to throw out any line
whose key isn't in all files, you'd need to make a dictionary for each
file, then analyze all of them in a later pass. That pass could
involve iterating through one of the dictionaries, and for each key
deciding if it's in all of the others. One way to do that is to build a
list and run all() on it.
DaveA
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