在Python中,split() 方法可以實現將一個字符串按照指定的分隔符切分成多個子串,這些子串會被保存到列表中(不包含分隔符),作為方法的返回值反饋回來。
split函數用法
split(sep=None, maxsplit=-1)
參數
sep – 分隔符,默認為所有的空字符,包括空格、換行(\n)、制表符(\t)等。
maxsplit – 分割次數。默認為 -1, 即分隔所有。
實例:
// 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)
// 也可以將字符串分割后返回給對應的n個目標,但是要注意字符串開頭是否存在分隔符,若存在會分割出一個空字符串
String1 = 'Hello'
String2 = 'world! Nice to meet you'
String.split('!')
// 選擇其他分隔符
['Hello world', ' Nice to meet you']
split函數實現
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
上圖為Pycharm文檔
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))
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