split(sep=None, maxsplit=-1)

// 例子
String = 'Hello world! Nice to meet you'
String.split()
['Hello', 'world!', 'Nice', 'to', 'meet', 'you']
String.split(' ', 3)
['Hello', 'world!', 'Nice', 'to meet you']
String1, String2 = String.split(' ', 1) 
// 也可以将字符串分割后返回给对应的n个目标，但是要注意字符串开头是否存在分隔符，若存在会分割出一个空字符串
String1 = 'Hello'
String2 = 'world! Nice to meet you'
String.split('!')
// 选择其他分隔符
['Hello world', ' Nice to meet you']

 def split(self, *args, **kwargs): # real signature unknown
    """
    Return a list of the words in the string, using sep as the delimiter string.
     sep
      The delimiter according which to split the string.
      None (the default value) means split according to any whitespace,
      and discard empty strings from the result.
     maxsplit
      Maximum number of splits to do.
      -1 (the default value) means no limit.
    """
    pass

def my_split(string, sep, maxsplit):
  ret = []
  len_sep = len(sep)
  if maxsplit == -1:
    maxsplit = len(string) + 2
  for _ in range(maxsplit):
    index = string.find(sep)
    if index == -1:
      ret.append(string)
      return ret
    else:
      ret.append(string[:index])
      string = string[index + len_sep:]
  ret.append(string)
  return ret
if __name__ == "__main__":
  print(my_split("abcded", "cd", -1))
  print(my_split('Hello World! Nice to meet you', ' ', 3))