Python day two: if judgment, while loop, for loop, pycharm use, numeric type, and string type

First, the content

Second, the String method

Http://www.cnblogs.com/fyknight/p/7895894.html

Third, practice

1. Write A For loop and use the index to iterate through each character

2. Write a while loop and use the index to iterate through each character

3. Replace ' world ' with Python in msg= ' Hello World '
4, the character's file name, file size, operation method cutting out

msg= '/etc/a.txt|888|get '

5, write a while loop, require the user to enter a command, if the command is empty, continue to enter

6, write while loop, let the user enter the user name and password, if the user is empty or number, then re-enter

7, write while loop, let the user input content, judge the input content to start with dark_knight, then add the string successfully end

8.
1. The two-layer while loop, the outer while loop, lets the user enter a user name, password, work for several months, a monthly salary (integer), a user name or password is empty, or the number of months of work is not an integer, or
The monthly salary is not an integer, re-enter
2. Successful authentication, go to the next layer while loop, Print command prompt, query the total salary, query user identity (if the user name is Alex Print Super User, if the user name is knight or Lisa
Print the normal user, the rest of the print unkown user), Exit function
3. Require user input to exit, exit all loops (using tag)

Python day two: if judgment, while loop, for loop, pycharm use, numeric type, and string type