Add characters to the end of all file and folder names

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import os
dir_path = "./dirname"
dir_list = os.listdir(dir_path)
for i in range(len(dir_list)):
new_file_name = dir_list[i] + "!!!"
os.rename(os.path.join(dir_path,dir_list[i]),os.path.join(dir_path,new_file_name))
How to modify or remove only certain characters from file and folder names

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import os
import glob
before_word = "!!!"
after_word = ""
files = glob.glob('*'+ before_word +'*')
for before_file_name in files:
after_file_name = before_file_name.replace(before_word,after_word)
os.rename(before_file_name,after_file_name)
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