合并Dict键值

Question

I have two files both with key and value. I am trying to merge them with corresponding key and value . Keys are present in both the files and value1 in file1 and value2 in file2 . The files have many columns and key in both files are in col[0] col[1]

I am trying to get something like this:

key  value1 value2

Code:

from collections import defaultdict

d2 = {}

with open('file2.txt', 'r') as file2:
    for row in file2:
        cols = row.strip().split()
        #print(cols);
        key = cols[0], cols[1]
        value1 = cols[4]
with open('file1.txt', 'r') as file1:
    for row in file1:
        cols = row.strip().split()
        #print(cols);
        key = cols[0], cols[1]
        value2 = cols[2]

        print ("%s %s %s %s\n" % (d2[cols[0]], d2[cols[1]], d2[cols[4]], d2[cols[2]]))

Error:

Traceback (most recent call last):
  File "test_two.py", line 21, in <module>
    print ("%s %s %s %s\n" % (d2[cols[0]], d2[cols[1]], d2[cols[4]], d2[cols[2]]))
KeyError: '3545' (first line)

Answer 1

for d in (file1,file2):

Here, f is one of your files.

    for key, value in d:  

If you iterate over the file, you get lines (strings). When you iterate over a line (string), you get characters . So, unless all lines in your files are two characters long, for key, value in d will fail.

The rest of your code ( cols = row.strip().split() ) seems right, although, it's not clear where row comes from. As Ashwini Chaudhary said, you probably wanted for row in d