comefrom: <qiyuangong>125_Valid_Palindrome_1.py
code: def isPalindrome( s):
      alnum_s = [t.lower() for t in s if t.isalnum()]
      ls = len(alnum_s)
      if ls <= 1:
          return True
      mid = ls / 2
      for i in range(mid):
          if alnum_s[i] != alnum_s[ls - 1 - i]:
              return False
      return True
masked: def sample_funcname ( var_0 ) :
      var_4 = [ var_1.lower ( ) for var_1 in var_0 if var_1.isalnum ( ) ]
      var_6 = len ( var_4 )
      if var_6 <= 1 :
          return True
      var_10 = var_6 / 2
      for var_12 in range ( var_10 ) :
          if var_4 [ var_12 ] != var_4 [ var_6 - 1 - var_12 ] :
              return False
      return True
  