python学习笔记（1）

猜数游戏：

import random

secret = random.randint(1,99)

guess = 0

tries=0

print("AHOY! I have a secret!It is a number from 1 to 99.I'll give you 6 tries.")

while guess!=secret and tries<6:

    guess=int(input("what's yer guess"))

    if guess < secret:

        print("Too low ,ye scurvy dog!")

    elif guess > secret:

        print("Too high ,ye scurvy dog!")

        

    tries=tries+1

        

if guess == secret:

   print("Avast! ye got it !Found my secret,ye did!")

else :

   print("No more guesses!Better luck next time ,matey")

   print("The secret number was",secret)

 

涉及指令：while、if、else、elif、input、print；

其中 print与input在Python2与Python3中略有不同；

在Python中关于循环的嵌套由缩进来掌控，所以在Python中有常见错误：

Python语言是一款对缩进非常敏感的语言，给很多初学者带来了困惑，即便是很有经验的Python程序员，也可能陷入陷阱当中。最常见的情况是tab和空格的混用会导致错误，或者缩进不对，而这是用肉眼无法分别的。

在编译时会出现这样的错IndentationError:expected an indented block说明此处需要缩进，你只要在出现错误的那一行，按空格或Tab（但不能混用）键缩进就行。

往往有的人会疑问：我根本就没缩进怎么还是错，不对，该缩进的地方就要缩进，不缩进反而会出错，，比如：

if xxxxxx：

（空格）xxxxx

或者

def xxxxxx：

（空格）xxxxx

还有

for xxxxxx：

（空格）xxxxx

一句话 有冒号的下一行往往要缩进，该缩进就缩进

  假如在上述代码中将缩进改为：

import random

secret = random.randint(1,99)

guess = 0

tries=0

print("AHOY! I have a secret!It is a number from 1 to 99.I'll give you 6 tries.")

while guess!=secret and tries<6:

    guess=int(input("what's yer guess"))

    if guess < secret:

        print("Too low ,ye scurvy dog!")

    elif guess > secret:

        print("Too high ,ye scurvy dog!")

        

    tries=tries+1

        

    if guess == secret:

        print("Avast! ye got it !Found my secret,ye did!")

    else :

        print("No more guesses!Better luck next time ,matey")

        print("The secret number was",secret)

那么，标注红色的部分也属于while循环中。