CODEWITHSUNDEEP
python
Lin Jiayin
Lin Jiayin

Reputation: 499

how to use python to deal with two file at the same time

I want to using python to open two files at the same time, read one line from each of them then do some operations. Then read the next line from each of then and do some operation,then the next next line...I want to know how can I do this. It seems that for loop cannot do this job.

Upvotes: 0

Views: 52

Answers (4)

Ren
Ren

Reputation: 2946

You can try the following code:

fin1 = open('file1')
fin2 = open('file2')

content1 = fin1.readlines()
content2 = fin2.readlines()

length = len(content1)

for i in range(length):
    line1, line2 = content1[i].rstrip('\n'),content2[i].rstrip('\n')
    # do something

fin1.close()
fin2.close()

Upvotes: 0

Joran Beasley
Joran Beasley

Reputation: 113930

file1 = open("some_file")
file2 = open("other_file")

for some_line,other_line in zip(file1,file2):
    #do something silly

file1.close()
file2.close()

note that itertools.izip may be prefered if you dont want to store the whole file in memory ...

also note that this will finish when the end of either file is reached...

Upvotes: 4

gm-br
gm-br

Reputation: 30

you can put inside a loop like that:

for x in range(0, n):
    read onde line
    read the other line

try it

Upvotes: 0

En-code
En-code

Reputation: 49

Why not read each file into a list each element in the list holds 1 line.

Once you have both files loaded to your lists you can work line by line (index by index) through your list doing whatever comparisons/operations you require.

Upvotes: 0

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