python_day1

简介：主要保存简单的条件循环语句，人机交互界面，打印输入语句

1、人机交互（几种字符串拼接）

# Author:Er
# 人机交互界面
"""username = input("username: ")
password = input("password: ")
print(username, password)
"""

# 字符串拼接的几种方式 推荐info1 info2

name = 'er'
age = '13'
info = '''
--------- info of '''+name+'''------
name : '''+name+'''
age : '''+age+'''
'''

info1 = '''
------info1 of %s ----
name : %s
age : %s
---------------------
''' % (name, name, age)


info2 = '''
--------info2 of {_name}----
name : {_name}
age : {_age}

'''.format(_name=name,  _age=age)

info3 = '''
-----info3 of {0}----
name : {0}
age : {1}
'''.format(name, age)

print(info, info1, info2, info3)

#input 输入的类型为字符型  <class 'str'>
age = input("age: ")
print(type(age))

# 强制转化 <class 'int'>

age = int(input("age :"))
print(type(age))

# name = raw_input("name: ") python2.x 中写法

2、条件与循环语句

# Author:Er
import getpass
_name = 'Er'
_password = 'abc123'

name = input("name: ")
#password = getpass.getpass("password : ")
#  在pycharm 里不显示，命令行模式下实验
password = input("password： ")

if _name == name and _password == password:
    print("welcome user {name} login ...".format(name=name))
else:
    print("invalid username or password!")
while True:
    break
for i in range(10):
    print("loop: ", i)

for j in range(0, 10, 2):      # 0~9,步长为2
    print("loop1: ", j)

k = 0
while k < 3:
    #break  # 非正常退出

    k = 4  # 正常退出
else:
    print("正常退出时才执行")


# print(password)

运行结果

E:PYvenvScriptspython.exe E:/PY/day1/passwd.py
name: er
password： er
invalid username or password!
loop:  0
loop:  1
loop:  2
loop:  3
loop:  4
loop:  5
loop:  6
loop:  7
loop:  8
loop:  9
loop1:  0
loop1:  2
loop1:  4
loop1:  6
loop1:  8

Process finished with exit code 0