Python编程快速上手

一、sys.exit()提前结束程序。　

#提前终止程序
import sys
while True:
print(‘Type exit to exit.‘)
response = input()
if response == ‘exit‘:
sys.exit()
else:
print(‘you typed‘+response+‘‘)

二、global语句

　　在函数中，如果被声明为global,则全局生效，影响函数外该变量值。

三、一个小程序，猜数字

#猜数字
import random
secretNumber=random.randint(1,20)
print(‘you thinking of 1-20‘)
for guessesTaken in range(1,7):
print(‘please input guess‘)
guess=int(input())
if secretNumber > guess:
print(‘you guess is low‘)
elif guess > secretNumber:
print(‘you guess is greate‘)
else:
break
if guess == secretNumber:
print(‘you are right,you guess in‘+str(guessesTaken)+‘guesses!‘)
else:
print(‘you are not right, this is ‘+str(secretNumber))

四、字典中的setdefault方法

     字典存在则为字典中的值，不存在则为0

#setdefault()方法的使用
import pprint
message= "It is dangjingwei,this is myself,this is a boy"
count={}
for character in message:
count.setdefault(character,0)
count[character]=count[character]+1
pprint.pprint(count)  ----漂亮的打印，如下，好看多了！！！

Python编程快速上手

原文：https://www.cnblogs.com/dangjingwei/p/14799678.html