Replace space with underscore using python-CodePudding

I need some help, I have a a txt file with spaces between words, I want to replace the space with underscore.

fileHandler = open('nog_rename_update.txt')
for eachline in fileHandler:
    new_name = fileHandler.replace("      ","_")
print(new_name)

That's my code but it keeps throwing error messages

new_name = fileHandler.replace(" ","_") AttributeError: '_io.TextIOWrapper' object has no attribute 'replace'

example files that I want to remove space and add underscore

CodePudding user response：

This opens the files, reads line by line, splits the line into two parts, and combines the two parts with an underscore. I stored it in a list that you can use to do your next step.

with open('nog_rename_update.txt') as f:

    new_list = []

    for line in f:
        # split the line
        split = line.split()
        new_list.append(split[0] "_" split[1])

# print the list to see results
print(new_list)

#
# add code to loop through the new list and to write to a file
#

CodePudding user response：

Try out this

fileHandler = open('nog_rename_update.txt').read()
new_name = fileHandler.replace(" ", "_")
print(new_name)

CodePudding user response：

f = open("test.txt", "r") 
text=f.read() 
f.close() 
f=open("testfile.txt", "w ") 
text2='' 
if ' ' in text: 
    text2 = text.replace(' ' , '_') 
    print(text2) 
    f.write(text2) 
f.close()

CodePudding user response：

Here's a generic approach that should work for you:

teststring = 'hello world     this is just a   test. don\'t mind me 123.'

# replace multiple spaces with one space
while '  ' in teststring:
    teststring = teststring.replace('  ', ' ')

# replace space with underscore (_)
teststring = teststring.replace(' ', '_')

print(teststring)
assert teststring == "hello_world_this_is_just_a_test._don't_mind_me_123."  # True

Using a file example:

fname = 'mah_file.txt'
with open(fname) as in_file:
    contents = in_file.read()
    while '  ' in contents:
        contents = contents.replace('  ', ' ')
# write updated contents back to file
with open(fname, 'w') as out_file:
    out_file.write(contents.replace(' ', '_'))

CodePudding user response：

Here is another, less verbose solution. Simply use re.sub:

import re

file_name = r"D:\projects\playground\python\data\test.txt"

with open(file_name, "r") as file:
    for line in file:
        print(re.sub("( ) ", "_", line), end="")

And if you want to replace the spaces in your text file:

import re

file_name = r"D:\projects\playground\python\data\test.txt"

lines = []

with open(file_name, "r") as file:
    lines = [
        re.sub("( ) ", "_", line) for line in file.readlines()
    ]

with open(file_name, "w") as file:
    file.writelines(lines)

Or use fileinput:

import re
import fileinput

file_name = r"D:\projects\playground\python\data\test.txt"

with fileinput.FileInput(file_name, inplace=True, backup=".bak") as file:
    for line in file:
        print(re.sub("( ) ", "_", line), end="")