python基础

#第一个python程序
# print(‘hello world‘)
# print(‘你好，世界‘)

#变量的命名
# AgeOfAlex=18#驼峰体
# age_of_alex=18#下划线

#内存空间
# a=20
# b=a
# a=10
# print(a,b)

#引号的使用
# print(‘I am a student‘)
# print("I‘m a student")
# msg="""
# 会当凌绝顶，
# 一览众山小。
# """
# print(msg)

#字符串的拼接
# print(‘alex‘+‘wusir‘)
# print(‘alex‘*4)

#input 用户交互  得到的是字符串
# name=input("name:")
# password=input("password:")
# print(name,password)
# print(type(name),type(password))

#条件控制语句 if elif else
# score=int(input("请输入成绩："))
# if score>=90:
#     print(‘A‘)
# elif score>=80:
#     print(‘B‘)
# elif score>=70:
#     print(‘C‘)
# else:
#     print(‘D‘)

#嵌套使用
# name=input("name:")
# age=int(input("age:"))
# if name==‘alex‘:
#     if age==18:
#         print(‘welcome‘)
#     else:
#         print(‘age error‘)
# else:
#     print(‘name error‘)

# while循环

# 死循环
# while True:
#     print(‘hello‘)

#输出1-100
# count=1
# while count<=100:
#     print(count)
#     count+=1

#计算1-100的和
# s=0
# count=1
# while count<=100:
#     s+=count
#     count+=1
# print(s)

#break跳出循环
#continue跳出本次循环 继续下一次循环
#else循环正常执行完毕才执行
# count=1
# while True:
#     print(count)
#     count+=1
#     if count>100:
#         break
# else:
#     print(‘循环正常执行完了才执行‘)
# print(‘--------end--------‘)


#输出1-5 95-100
# count=0
# while count<100:
#     count+=1
#     if count>5 and count<95:
#         continue
#     else:
#         print(count)

#标志位 输出1-100
# flag=True
# count=1
# while flag:
#     print(count)
#     if count==100:
#         flag=False
#     count+=1

#格式化输出 %s %d
# name=input(‘name:‘)
# age=int(input(‘age:‘))
# hobby=input(‘hobby:‘)
# msg="""
# -----info of %s-----
# name:%s
# age:%d
# hobby:%s
# ---------end----------
# """%(name,name,age,hobby)
# print(msg)

#%%
# print(‘%s的数学成绩占20%%‘%(‘alex‘))