Python 条件判断和函数入门

一门编程语言中基本的单元就是函数，基本的结构就是条件判断循环等等。

今天简单分析一下条件判断与函数初步。

#coding=utf-8
print("this is a varchar")
 # 1、if 语句嵌套
month = int(input("please enter a month: "))
if 1 <= month <= 12:
  print("input month correctly")
  if month <= 3:
    print("spring")
  elif month <= 6:
    print("summer")
  elif month <= 9:
    print("autumn")
  else:
    print("winter")
else:
  print("input error")
# 如果输入字符串等非数字就会报错

# 2 if-else
# 表达式1 if 判断 else 表达式2
money = int(input("please input price"))
pay = money - 20 if money >= 100 else money
print(pay)
 # 如果价格超过100元，那么总价减20元。
 # 3 输入
money = input("please input money")
moneyNew = int(money)
print(moneyNew)
 # pass 空语句
pass
# 循环语句

# no parameter
def function():
  print("this is a function")
  a = 1 + 2
  print(a)
 # if you create a function, the function can't run by itself. You should run it.
function()
 # two parameters
def func(a, b):
  c = a + b
  d = str(c)
  print("this is sum " + d)

func(1, 2)