#! /usr/bin/env python

import os
import sys

files = os.listdir("./")
for f in files:
	os.rename (f, f.replace(' ', '_'))

9ad735e969124ab723acfeb6ff370a842d5f1902
<mask token>

<mask token>
for f in files:
    os.rename(f, f.replace(' ', '_'))

<mask token>
files = os.listdir('./')
for f in files:
    os.rename(f, f.replace(' ', '_'))

import os
import sys
files = os.listdir('./')
for f in files:
    os.rename(f, f.replace(' ', '_'))

#! /usr/bin/env python

import os
import sys

files = os.listdir("./")
for f in files:
	os.rename (f, f.replace(' ', '_'))
