def while_1(): n = 100000 while 1: n -= 1 if n <= 0: break def while_true(): n = 100000 while True: n -= 1 if n <= 0: break m, n = 1000000, 1000000 %timeit -n 100 while_1() %timeit -n 100 while_true() 100 loops, best of 3: 3.69 ms per loop 100 loops, b...
Can you remove items while iterating from a list? You can use list comprehension to remove items from a list while iterating over it. What is the difference between the remove() and pop() functions? Theremove()function removes an item from a list and returns the new list, while thepop...
If yes, delete the item using adelkeyword Reduce the list size Show Solution Solution 1: Using while loop number_list=[10,20,30,40,50,60,70,80,90,100]i=0# get list's sizen=len(number_list)# iterate list till i is smaller than nwhilei<n:# check if number is greater than 50if...
to get fast response from the server use small sizetry:#Create an AF_INET (IPv4), STREAM socket (TCP)tcp_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)exceptsocket.error, e:print'Error occurred while creating socket. Error code: '+str(e[0]) +' , Error...
There is a way to remove an item from a list given its index instead of its value: thedelstatement. This differs from thepop()method which returns a value. Thedelstatement can also be used to remove slices from a list or clear the entire list (which we did earlier by assignment of ...
items(), key=lambda item: item[1], reverse=True)) { 'Fiona': 95.6, 'Charlie': 92.3, 'Alice': 89.5, 'Ethan': 88.9, 'Diana': 84.7, 'Hannah': 81.2, 'Bob': 76.0, 'George': 73.4 } The sorted() function returns a list of sorted values, so you wrap its call with dict() to...
一、List(列表) 1、什么是 List (列表) List (列表)是 Python 内置的一种数据类型。 它是一种有序的集合,可以随时添加和删除其中的元素。 但是这样太麻烦了,而且也不美观。 这时候就可以使用列表了。 2、怎么创建 List(列表) 从上面的例子可以分析出,列表的格式是这样的。
filter(fun, numList) # get [6, 7], if fun return True, retain the element, otherwise delete it filter(lambda x : x % 2 == 0, numList) # zip() name = ["me", "you"] age = [25, 26] tel = ["123", "234"] zip(name, age, tel) # return a list: [('me', ...
In other words, it allows you to update, add, delete, and pop key-value pairs. The difference in this case is that these operations act on the first mapping only:Python >>> from collections import ChainMap >>> numbers = {"one": 1, "two": 2} >>> letters = {"a": "A", "b...
print i, item i+=1 现在我们这样操作: for i, iteminenumerate(iterable): print i, item enumerate函数还可以接收第二个参数。就像下面这样: >>>list(enumerate('abc'))[(0,'a'),(1,'b'),(2,'c')]>>>list(enumerate('abc',1))[(1,'a'),(2,'b'),(3,'c')] ...