python for enumerate

[1]), (2, seq[2]), ... | | Methods defined here: | | __getattribute__ (...) | x.__getattribute__ (' name ') Methods of traversing sequences ? 1 2 3 4 5 6 7 >>> list = [' A ', ' B ', ' C '] >>> for index, value in enumerate (list): Print index, value 0 a 1 B 2 c >> ;> Six, using the Python random module's sample function randomly select a group of elements from the list

Python-1 python basics, python-1python Python Lesson 1 code note hello world [Root @ heartbeat-data-1 python] # vim hello1.py #! /Usr/bin/env pythonprint ('Hello world! ') [Root @ heartbeat-data-1 python] #

initial value of sum = 0 # Sets the initial value of a total number to store the calculated result of the total number while count 3. All the even numbers in the output 1-100For I in Range (1,101): If I% 2 = = 0: print (i)4. All the odd numbers in the output 1-100For I in Range (1,101): If I% 2! = 0: print (i)5, to seek the 1-2+3-4+5-6...99 of all the number andMethod One:Count = 1sum = 0while Count Method Two:sum = 0for i in range (1,100): if I% 2 = = 0: sum = s

Python sequence type, python Sequence In python,Sequence typeIncludingString(Common string and unicode string ),ListAndTuplesThe so-called sequence, that is, the sequential arrangement of members, can be accessed by subscript. Assume that there are n elements in the sequence. when accessing a single element, the subscript starts from 0 and ends with n-1. If it is

Built-in functions learned by the python tribe, python tribe Recently, I joined the python tribe. I felt that it was very interesting. I had a bit of fun. I learned a lot of built-in functions that I didn't know before, and I felt that I was about to remember them. So I started to display them. 1. divmod (a, B): Take the quotient and remainder of a divided by B,

Python traverses the serial number and value in the list (three methods), python serial number Three methods are used to traverse the serial numbers and values in the list: I recently learned the python language and felt that it has greatly improved my work efficiency. I wrote this blog on Valentine's Day. I will not talk about it here, but I will post it direc

sleep #The third param means the Lock def loop(nloop,sec,lock): print "Thread ",nloop," start and will sleep ",sec; sleep(sec); print "Thread ",nloop," end ",sec; lock.release(); def main(): seconds=[4,2]; locks=[]; for i in range(len(seconds)) : lock=thread.allocate_lock(); lock.acquire(); locks.append(lock); print "main Thread begins:",ctime(); for i,lock in enumerate(locks): thread.start_new_thread(loop,(i,c

Python BASICS (12)-module, python basics-Module URL: http://www.cnblogs.com/archimedes/p/python-modules.html.Module Introduction If you exit the Python interpreter and re-enter, all previously created definitions (variables and functions) will be lost. Therefore, if you want to write a program that has been saved for a

interested in: In-depth introduction to the use of parameters in Python functions and the traps of default parameters Use Python built-in modules and functions to convert numbers in different hexadecimal formats Usage Analysis of element traversal using the enumerate function in python Exploring the use of open f

Python mutable and immutable objectsAll of the data in Python is built around objects, which can be divided into two categories: mutable objects and immutable objects. When a variable is assigned a value, the variable holds an object reference (which can be understood as a pointer in C), pointing to the area in memory where the object resides.For an immutable object, the object itself cannot be changed (or

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