Check whether a given file exists or not

File Validation

# check whether given file exist or not and readable too
import os

# first approach
# I think it is best practice to use this approach
def validate_file(file_name):
  if os.path.isfile(file_name) and os.access(file_name, os.R_OK):
    return True
  else:
    return False

# second approach
def validate_file(file_name):
  if os.path.exists(file_name):
    return True
  else:
    return False