Python Script to Replace the File Names in a Folder

multi_filename_replace.py

# 
# Python Script to Replace the File Names in a Folder
# Changes by @m-etka
# 

import os

# Get working directory
path = os.getcwd()

# Read desired input as string
before = raw_input("Replace From: ")
after = raw_input("Replace To: ")

# Loop files in the directory
for filename in os.listdir(path):
    filename_without_ext = os.path.splitext(filename)[0]
    extension = os.path.splitext(filename)[1]

    # Find before text in filename, if exists change the value
    if before in filename_without_ext:
        new_file_name = filename_without_ext.replace(before, after)
        new_file_name_with_ext = new_file_name + extension
        os.rename(
            os.path.join(path, filename),
            os.path.join(path, new_file_name_with_ext)
        )

I changed input() with raw_input() in order to get rid of casting errors.
Also changed path to working directory (Original one have problems with macOS).
Lastly, added a control for before text in filename.

# 
# Python Script to Replace the File Names in a Folder 
# 

import os

# Get working directory
path = os.getcwd()

# Read desired input as string
before = raw_input("Replace From: ")
after = raw_input("Replace To: ")

# Loop files in the directory
for filename in os.listdir(path):
    filename_without_ext = os.path.splitext(filename)[0]
    extension = os.path.splitext(filename)[1]

    # Find before text in filename, if exists change the value
    if before in filename_without_ext:
        new_file_name = filename_without_ext.replace(before, after)
        new_file_name_with_ext = new_file_name + extension
        os.rename(
            os.path.join(path, filename),
            os.path.join(path, new_file_name_with_ext)
        )