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Python学习记录day1

Python学习记录博客是本人记录学习python3过程中的一些记录和过程,日后也可以帮助自己温习。

python优点:

1.Python入门简单,功能强大,适用性强;

2.开发效率高,第三方库强大且多;

3.Python无需考虑底层细节;

4.可移植性,跨平台;

5.可扩展性;

6.可嵌入性,Pthon可嵌入到C/C++程序中;

python缺点:

1.速度慢,Python比C慢很多,比java也慢一点;

2.代码不能加密,源码是明文;

3.线程不能利用多 CPU 问题;

python版本2和3的区别:

1.python3支持中文,不需要特别声明字符编码;

2.一些语法变化;

3.库名变化;

4.去除库中某些冗余功能

变量定义的规则:

1.变量名只能是字母、数字或下划线的任意组合;

2.变量名的第一个字符不能是数字;

3.以下关键字不能声明为变量名:

[‘and‘, ‘as‘, ‘assert‘, ‘break‘, ‘class‘, ‘continue‘, ‘def‘, ‘del‘, ‘elif‘, ‘else‘, ‘except‘, ‘exec‘, ‘finally‘, ‘for‘, ‘from‘, ‘global‘, ‘if‘, ‘import‘, ‘in‘, ‘is‘, ‘lambda‘, ‘not‘, ‘or‘, ‘pass‘, ‘print‘, ‘raise‘, ‘return‘, ‘try‘, ‘while‘, ‘with‘, ‘yield‘]

ASCII码:

http://www.asciima.com/

交互式输入

python2有raw_input和input,使用input输入时,只能输入变量名或者数字

python3只有input,默认输入的变量是string类型

Tab补全模块

vim /usr/local/python/lib/python2.7/site-packages/tab.py

# python startup file
import sys
import readline
import rlcompleter
import atexit
import os
# tab completion
readline.parse_and_bind(‘tab: complete‘)
# history file
histfile = os.path.join(os.environ[‘HOME‘], ‘.pythonhistory‘)
try:
    readline.read_history_file(histfile)
except IOError:
    pass
atexit.register(readline.write_history_file, histfile)
del os, histfile, readline, rlcompleter

猜年龄(数字)游戏

#!/usr/bin/env python
#_*_coding:utf-8_*_
‘‘‘
* Created on 2016/10/10 19:29.
* @author: Chinge_Yang.
‘‘‘

age = 27
count = 0

for i in range(10):
   if count < 3:
       guess_num = int(input("Input your guess number:"))
       if age == guess_num:
           print("Congraturation,you are right!")
           break
       elif age > guess_num:
           print("You guess it smaller than it!")
       else:
           print("You guess it bigger than it!")
       count += 1
   else:
       continue_confirm = input("Do you want to continue(y|n):")
       if continue_confirm == "y":
           count = 0
       else:
           print("bye")
           break

Python学习记录day1