# Python code to demonstrate working of # in and is # using "in" to check if 's' in 'geeksforgeeks': print ("s is part of geeksforgeeks") else : print ("s is not part of geeksforgeeks") # using "in" to loop through for i in 'geeksforgeeks': print (i,end=" ") print...
Construct an iterator from those elements of iterable for which function returns true. iterable may be either a sequence, a container which supports iteration, or an iterator. If function is None, the identity function is assumed, that is, all elements of iterable that are false are removed. ...
defsave_website_title(url,filename):"""获取某个地址的网页标题,然后将其写入到文件中:returns:如果成功保存,返回 True,否则打印错误,返回 False"""try:resp=requests.get(url)obj=re.search(r'(.*)',resp.text)ifnot obj:print('save failed: title tag not found in page content')returnFalse title...
You can execute code based on the Boolean answer of a function: Example Print "YES!" if the function returns True, otherwise print "NO!": defmyFunction() : returnTrue ifmyFunction(): print("YES!") else: print("NO!") Try it Yourself » ...
# -*- coding: utf-8 -*- import requests import re def save_website_title(url, filename): """获取某个地址的网页标题,然后将其写入到文件中 :returns: 如果成功保存,返回 True,否则打印错误,返回 False """ try: resp = requests.get(url) obj = re.search(r'(.*)', resp.text) if not...
is true. If function is None, return the items that are true. """ 翻译:如果函数里面每个对象都是True,返回一个可迭代对象的生成器。如果函数为空,这返回对象里面每个为True的值。注意返回的是对象里面不为False的值 View Code 9.enumerate The enumerate object yields pairs containing a count (from sta...
Return a Boolean value, i.e. one of True or False. x is converted using the standard truth testing procedure. If x is false or omitted, this returns False; otherwise it returns True. The bool class is a subclass of int (see Numeric Types — int, float, complex). ...
If function is None, return the items that are true. | | Methods defined here: | | __getattribute__(self, name, /) | Return getattr(self, name). | | __iter__(self, /) | Implement iter(self). | | __next__(self, /) | Implement next(self). | | __reduce__(...) | ...
一类是generator,包括生成器和yield关键字的生成器函数generator function。 ⽣成器不但可以作⽤于for循环,还可以被next()函数不断调⽤并返回下⼀个值,直到最后抛出StopIteration错误表示⽆法继续返回下⼀个值了。 这些可以直接作用于for循环的对象统称为可迭代对象:Iterable. ...
group) Help on built-in function group: group(...) group([group1, ...]) -> str or tuple. Return subgroup(s) of the match by indices or names. For 0 returns the entire match. In [63]: mat1.group() #匹配到的全部字符串 Out[63]: 'lo' In [66]: mat1.group(0) #匹配到的...