1  #!/usr/bin/env python3
       2  
       3  # Fix Python script(s) to reference the interpreter via /usr/bin/env python.
       4  # Warning: this overwrites the file without making a backup.
       5  
       6  import sys
       7  import re
       8  
       9  
      10  def main():
      11      for filename in sys.argv[1:]:
      12          try:
      13              f = open(filename, 'r')
      14          except IOError as msg:
      15              print(filename, ': can\'t open :', msg)
      16              continue
      17          with f:
      18              line = f.readline()
      19              if not re.match('^#! */usr/local/bin/python', line):
      20                  print(filename, ': not a /usr/local/bin/python script')
      21                  continue
      22              rest = f.read()
      23          line = re.sub('/usr/local/bin/python',
      24                        '/usr/bin/env python', line)
      25          print(filename, ':', repr(line))
      26          with open(filename, "w") as f:
      27              f.write(line)
      28              f.write(rest)
      29  
      30  if __name__ == '__main__':
      31      main()