Python第一阶段01

1.变量：

name = "sisi"
print(name)

age = 11
print(age)

2.常量：

PIE = 3.1415926

3.注释：

# password = "aaaa"
'''password = sisi'''

"""aaaaaaaaaa
aaaaaaa"""

4. 输出多行字符：

a = '''haha
efefejfijeofjeof
djendejndenfef
'''
print(a)

b = """aaaaaaaaaa
aaaaaaa"""
print(b)

5.用户交互程序：

name = input("name:")
age = input("age:")
salary = input("salary:")
print(name, age, salary)

print(type(age))

a = '''name = %s, age = %s, salary = %s''' % (name, age, salary)
b = '''name = {name}, age = {age}, salary = {salary}'''
c = '''name = {_name}, age = {_age}, salary = {_salary}'''.format(__name = name, __age = age, __salary = salary)
d = '''name = {0}, age = {1}, salary = {3}'''
print(a)

6.密码密文输入：

import getpass

username = input("name: ")
password = getpass.getpass("password: ")
print(username, password)

7. if...else流程判断：

import getpass

name = "sisi"
passwd = "123"

username = input("name: ")
# password = getpass.getpass("password: ")
password = input("password: ")

if username == name and password == passwd:
    print("Loggin in...")

    print("Welcome user {name} login...".format(name = username))

    print(username, password) 

else: print("error")

8.While循环：

count = 0
while True:
    print("count: ", count)
    count = count + 1
    if count == 100:
        break

9.循环优化for循环：

for i in range(10):
    print("loop", i )    #0 ~10

for i in range(0, 10, 2):   # range(开始值，结束值，步长)
    print(i)