2021-10-13Python入门3

• 实现整体缩进的方法：
  Ctrl+[ 为左退；Ctrl+] 为右进

randint() Ta会随机返回一个随机的整数

import random
secret = random.randint(1,10)
print('----------我爱鱼c工作室----------')
temp = input("不妨猜猜小甲鱼现在心里在想的数字：")
guess = int(temp)
if guess == secret:
    print("你猜对了！")
else:
    if guess > secret:
        print("大了大了")
    else:
        print("小了小了")
while guess != secret:
    temp = input("猜错了，再输入一次：")
    guess = int(temp)
    if guess == secret:
        print("你猜对了！")
    else:
        if guess > secret:
            print("大了大了")
        else:
            print("小了小了")
print("游戏结束")

• 整型
• 浮点型
• e记型
• 布尔类型（特殊的整型）

>>> a = '520'
>>> b = int(a)
>>> b
520
>>> a = '小甲鱼'
>>> b = int(a)
Traceback (most recent call last):
  File "", line 1, in 
    b = int(a)
ValueError: invalid literal for int() with base 10: '小甲鱼'
>>> a = 5.99
>>> b = int(a)
>>> b
5
>>> a = '520'
>>> b =float(a)
>>> b
520.0
>>> a = 5.99
>>> c =str(a)
>>> c
'5.99'
>>> c = str(5e19)
>>> c
'5e+19'
>>> str = 'I love fish'
>>> str
'I love fish'
>>> a = str(5e19)
Traceback (most recent call last):
  File "", line 1, in 
    a = str(5e19)
TypeError: 'str' object is not callable
>>> 

• type()

>>> a = '520'
>>> type(a)

>>> type(True)

>>> type(5e19)

>>> 

• isinatance()

>>> a = '小甲鱼'
>>> isinstance(a,str)
True
>>> isinstance(a,int)
False
>>> 

and/or/not(取相反值)