CODEWITHSUNDEEP
python
Alvaro E
Alvaro E

Reputation: 85

How to write in Python from a text file

I'm trying to open a text file and write to the file but when doing so it's not working at all.

Here's what I have: 

changeaddress = [changeaddr1, changeaddr2]
address = [address_1, address_2]
new_var = []
cur_addr = 0
with open('address.txt','r+') as file:
    for line in file:
        if address[cur_addr] in line:
            line.replace(address[cur_addr], changeaddress[cur_addr])
            cur_addr += 1
        new_var.append(line)

with open('address.txt','w') as file:
    file.writelines(new_var)

what I'm doing wrong? it's not working. thanks!

Upvotes: 0

Views: 73

Answers (1)

OneCricketeer
OneCricketeer

Reputation: 191993

Strings are immutable. line.replace returns a new string, not literally replaces it. 

new_line = line.replace
... 
new_var.append(new_line)

Note: storing the whole list in memory will be bad for large files. You can open two files in one with command to read from one file, and write to another

Upvotes: 1

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