Py-day1 simple use method and syntax use details, py-day1 use Details

Py-day1 simple use method and syntax use details, py-day1 use Details

1. Getting started with python

1. standard python format

Create a python file ending with. py

For example, vi hello. py

#! /Usr/bin/env python

#-*-Coding: UTF-8-*-# Chinese characters can be used by default for Versions later than python3.5.

Print "Hello Word"

Run:

Python hello. py

Or add the execution permission: chmod 755 hello. py.

./Hello. py

 

2. Variables

Name = "liudong"

Name2 = name

Then name = "liuyansheng"

# Name2 remains unchanged because it is re-created once modified. Name2 will open up a new memory space.

 

The set is different:

Name = ['Liu ', 'any', 'sheng',]

Name2 = name

# Name2 changes because different elements in the set and string are not continuous. Adding an element in name will not open up a new space, and name2 will change.

 

3. Input

Name = raw_input ("Enter the User name :")

# Print the output content

Print name

 

To hide a password, use the getpass method in the getpass module, that is:

#! /Usr/bin/env python

#-*-Coding: UTF-8 -*-

# Liudong

Import getpass

# Assign the value of user input to the name variable

Pwd = getpass. getpass ("enter the password :")

# Print the input content

Print name

 

4. Process Control

(1) user identity authentication:

Syntax: if... else if... elif... else

#! /Usr/bin/env python

#-*-Coding: UTF-8 -*-

# Liudong

Import getpass

Name = raaw_input ("Enter the User name :")

Pwd = raw_input ("enter the password :")

If name = "liudong" and pwd = "123456 ":

Print "Login successful"

Else:

Print "Logon Failed"

(2) Guess age:

#! /Usr/bin/env python

#-*-Coding: UTF-8 -*-

# Liudong

Liudong = 24

Guess_age = int (input ("guess age :"))

If guess_age = liudong:

Print ("yes ")

Elif guess_age> liudong:

Print ("smaller ....")

Else:

Print ("bigger ....")

 

Loop Three times, right click to exit:

#! /Usr/bin/env python

#-*-Coding: UTF-8 -*-

# Liudong

Liudong = 24

Count = 0

While True:

If count = 3:

Break

Guess_age = int (input ("guess age :"))

If guess_age = liudong:

Print ("yes ")

Break

Elif guess_age> liudong:

Print ("smaller ....")

Else:

Print ("bigger ....")

Count + = 1

 

A maximum of three rounds can be guessed. The system automatically exits. The system prompts "fuck off" by mistake ":

#! /Usr/bin/env python

#-*-Coding: UTF-8 -*-

# Liudong

Liudong = 24

Count = 0

While count <3

Guess_age = int (input ("guess age :"))

If guess_age = liudong:

Print ("yes ")

Break

Elif guess_age> liudong:

Print ("smaller ....")

Else:

Print ("bigger ....")

Count + = 1

Else:

Print ("fuck off ")

Note: continue jumps out of the current loop, and break jumps out of the entire loop.

 

5. Flag Space