字符串處理絕對是任何一門語言的重點。

str.partition(sep)

Split the string at the first occurrence of sep, and return a 3-tuple containing the part before the separator, the separator itself, and the part after the separator. If the separator is not found, return a 3-tuple containing the string itself, followed by two empty strings.

mystr = ‘hello,!!!world‘
print(mystr.partition(‘,‘))
# output
(‘hello‘, ‘,‘, ‘!!!world‘)

str.split(sep=None, maxsplit=-1)

Return a list of the words in the string, using sep as the delimiter string. If maxsplit is given, at most maxsplit splits are done (thus, the list will have at most maxsplit+1

str.join(iterable)

Return a string which is the concatenation of the strings in iterable. A TypeError will be raised if there are any non-string values in iterable, including bytes

mylist = [‘first‘, ‘second‘, ‘third‘]
mystr = ‘#‘.join(mylist)
print(mystr)
# output: first#second#third

str.startswith(prefix, start, end)

Return True if string starts with the prefix, otherwise return False. prefix can also be a tuple of prefixes to look for. With optional start, test string beginning at that position. With optional end, stop comparing string at that position.

mystr = "this is string example....wow!!!"
print(mystr.startswith(‘this‘))
print(mystr.startswith(‘is‘, 2, 4))
print(mystr.startswith(‘this‘, 2, 4))

輸出如下:

True
True
False

python字符串處理