function：python基础语法练习
"""

#import this

name = "tom"
age = 29

str1 = "hello," + name + "; age," + str(age)
str2 = "hello,%s ; age,%d " %(name,age)
str3 = "hello,{n} ; age,{a}".format(n=name,a=age)
print(str3)


# n = input("input you name:")
# print("hello-->",name)

# 引号的使用
print("他说：'你好'！ ")
print('他说："你好"！ ')

'''
'''
# 顺序、分支、循环

"""
a == b 相等
a >= b 大于等于
a <= b 小于等于
a != b 不等于
a is b 是
a is not b 不是

a = 4
b = 5
if a > b:
print("a big")
else:
print("b big")

if True:
print("run this info")

c = True
if c is True:
print("run this info")

if c is not False:
print("run this info")

d = None
if d is None:
print("d is None")

number = 77
if number > 90:
print("优秀")
elif number > 70:
print("良好")
elif number > 60:
print("及格") 
else:
print("不及格")


hello = "hello"
for i in hello:
print(i)