前3课
同学们可以复制运行，查看结果
初识Python
阅读以下代码，分析其运行结果
py
print("1+1")
print(1, 2, "3", 4)
print(100+200)
print(100-200)
print(100/200)
print(100*200)py
print(1+1, 2+3, sep='')
print("hello", "world", end='')
print("你好" + "世界")py
print(1, 1, '=', 1+1, sep='+')
print(print("hello"))变量
阅读以下代码，分析其运行结果
py
a = 100
b = 200
print(a+a+b)
b = 100
print(a+b+b)py
x = y = 10
print(x*y)
x = 20
y = x
print(x+y)
x = x+10
print(x*y)py
kabvkbvbdkbifiubkvbdfkv = 5.1
print(kabvkbvbdkbifiubkvbdfkv + 10)
kabvkbvbdkbifiubkvbdfkv = kabvkbvbdkbifiubkvbdfkv - 1
print(kabvkbvbdkbifiubkvbdfkv)字符串
阅读以下代码，分析其运行结果或运行效果
py
a = 3.1415
a = int(a)
print(a)
a = str(a+0.5)
print(a)py
a = float(3) + float(2)
print(a)
a = a + int("20")
print(a)
b = str(a)+'0'
print(b)py
hello = 10 + 20.0
print(type("hello"))
print(type(hello - 1))
print(type(int(hello)))py
a = int(input("请输入一个数字：")) + 10
print(a)
a = input("请输入一个数字：")
print(a)