week_one-python基础 基本语法、流程控制

金角大王的紫金葫芦,python开发环境介绍链接：
http://list.youku.com/albumlist/show/id_28961509.html

# Author:larlly

python2.x需要字符编码utf-8，才可以支持中文

# _*_  coding:utf-8 _*_
 
# 用户输入
name3 = input("what is your name : ")
 
print ("my name is ",name3 )
 
#输入密码时如果想要不可见，就要用getpass模块中的getpass方法
 
#加密
import getpass
#pwd = getpass.getpass("请输入密码：")
pwd = input("请输入密码：")
print(pwd)
 
# 模块初识，python的强大之处在于他有非常丰富和强大的标准库和第三方库。
 
sys库
import sys
print(sys.argv)
输出
python 1.py hello world   #把执行脚本时传递的参数获取到
['1.py','hello','world']    就是一个列表    [0] [1] [2]
 
print(sys.path)  #查看python环境变量列表
 
os库
调用系统命令
import os
os.system("df -h")
 
结合os,sys模块
import os,sys
os.system(''.join(sys.argv[1:1]))  #把用户输入的参数当作一条命令交给os.system来执行
 
打印类型
print( type(username))
 
判断if-else:
import getpass
_username = "larlly"
_password = "123"
username = input("what is your name: ")
 
password = input("qing shu ru mi ma: ")
#password = getpass.getpass("请输入密码：")
if _username == username and _password == password:
    print("welcome login" ,username )
else:
    print("username or password is error ！")

#打印字符串
print ("his name is %s " %("a"))
 
#打印整数
print ("he is %d years old" %(25))
 
#打印浮点数
print ("his height is %f m" %(1.68))
#打印浮点数（指定保留小数点位数）
print ("his height is %.2f m"%(1.69))
 
#指定占位符宽度
print ("name:%10s age:%8d height:%8.2f"%("abc",25,1.69))
 
#指定占位符宽度（左对齐）
print("name:%-10s age:%-8d height:%-8.2f"%("abc",25,1.69))
 
#指定占位符（只能用0当占位符）
print ("name:%-10s age:%08d height:%08.2f"%("abc",25,1.69))
 
#科学计数法
print(format(0.0015,'.2e'))

#格式化输出（俩种格式）
 
name = input("name:")
age = input("age:")
job = input("job:")
salary = input("salary:")
 
info = ''' Info of the ''' + name +'''
Name:''' + name +'''
Age:''' + age + '''
Job:''' + job + '''
Salary:''' + salary + '''
'''
 
"""
info = '''INFO OF THE %s
NAME:%s
AGE:%s
JOB:%s
SALARY:%s
''' % (name,name,age,job,salary)
"""
print(info)

 
#猜测年龄，超过三次就跳出
 
count = int(0)
age = int(25)
while (count < 3):
    age_guess = int(input("请输入我的年龄： "))
    if age == age_guess:
        print("very good ,your answer is good")
        break
    elif age_guess < age:
        print("your answer can older")
    else:
        print("your answer can younger")
    count +=1
else：
    print("兄弟，都三次啦@")
 
for循环及if-elif-else嵌套
for i in range(10):
    print("larlly:",i)
 
#i小于5跳出本次循环，等于5打印，大于5中断
for i in range(10):
    if i < 5:
        continue
        print(i)
    elif i == 5:
        print(i)
    else:
        break
        print(i)
 
#死循环
count = 0
while True:
    print("who is that ?")
    count += 1
 
#循环百次
count = 0
while count <100:
    print("who is that ?")
    count += 1
    print (count)
 
count = 0
while True:
    print("who is that ?")
    count += 1
    print(count)
    if count == 100:
        print("该中断了")
        break