如何分析python中的while语句
本篇文章为大家展示了如何分析python中的while语句,内容简明扼要并且容易理解,绝对能使你眼前一亮,通过这篇文章的详细介绍希望你能有所收获。
零基础python入门-06 while语句
while语句示例
输入:
#!/usr/bin/python
# Filename: while.py
number = 23
running = True
while running:
guess = int(input('Enter an integer : '))
if guess == number:
print('Congratulations, you guessed it.') running = False
# this causes the while loop to stop
elif guess < number:
print('No, it is a little higher than that.')
else:
print('No, it is a little lower than that.')
else:
print('The while loop is over.')
# Do anything else you want to do here
print('Done')
输出:
Enter an integer : 50
No, it is a little lower than that.
Enter an integer : 22
No, it is a little higher than that.
Enter an integer : 23
Congratulations, you guessed it.
The while loop is over.
Done
解释:
相比于if语句,所有代码判断一遍,执行完毕即可。While 为状态条件,如果状态条件始终满足,那么while后的语句会循环执行。
直到状态条件不满足时,跳出循环。
本例中 前两次输入的所猜的数字没有和实际数字相匹配时,running作为状态条件始终为改变,所以循环执行未跳出。第3次猜中,running状态更改 running=False,此时While循环结束跳出,继续执行,输出Done
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