在python中打印为字典

Question

I have a problem in python. I want to create a function to print a file from user to a new file (example.txt).

The old file is like this:

{'a':1,'b':2...)

and I want the new file like:

a   1,b   2(the next line)

But the function which I made can run but it doesn't show anything in the new file. Can someone help me please.

def printing(file):
    infile=open(file,'r')
    outfile=open('example.txt','w')

    dict={}
    file=dict.values()
    for key,values in file:
        print key
        print values
    outfile.write(str(dict))
    infile.close()
    outfile.close()

Answer 1

This creates a new empty dictionary:

dict={}

dict is not a good name for a variable as it shadows the built-in type dict and could be confusing.

This makes the name file point at the values in the dictionary:

file=dict.values()

file will be empty because dict was empty.

This iterates over pairs of values in file .

for key,values in file:

As file is empty nothing will happen. However if file weren't empty, the values in it would have to be pairs of values to unpack them into key , values .

This converts dict to a string and writes it to the outfile :

outfile.write(str(dict))

Calling write with a non-str object will call str on it anway, so you could just say:

outfile.write(dict)

You don't actually do anything with infile .

Answer 2

You can use re module (regular expression) to achieve what you need. Solution could be like that. Of course you can customize to fit your need. Hope this helps.

import re
def printing(file):
   outfile=open('example.txt','a')
   with open(file,'r') as f:
       for line in f:
           new_string = re.sub('[^a-zA-Z0-9\n\.]', ' ', line)
           outfile.write(new_string)

printing('output.txt')