python基础1-字符串拼接、流程控制 

一、字符串拼接方式
1.用加号(+)
 1 name = input("input your name :")
 2 age = input("input your age :")
 3 job = input("input your job :")
 4 salary = input("input your salary :")
 5 
 6 info = '''
 7 ----------info of ''' + name +'''--------------
 8 Name:''' + name + '''
 9 Age: '''+ age + '''
10 job: '''+ job + '''
11 salary: '''+ salary
12 
13 print(info)


2.用占位符(%)






 1 name = input("input your name :")
 2 age = input("input your age :")
 3 job = input("input your job :")
 4 salary = input("input your salary :")
 5 
 6 info = '''
 7 ----------info of %s--------------
 8 Name:%s
 9 Age:%s
10 job:%s
11 salary:%s
12 ''' %(name,name,age,job,salary)
13 print(info)






3.用format()
（1）占位符




 1 name = input("input your name :")
 2 age = input("input your age :")
 3 job = input("input your job :")
 4 salary = input("input your salary :")
 5 
 6 info = '''
 7 ----------info of {0}--------------
 8 Name:{0}
 9 Age:{1}
10 job:{2}
11 salary:{3}
12 '''.format(name,age,job,salary)
13 print(info)






（2）关键字




 1 name = input("input your name :")
 2 age = input("input your age :")
 3 job = input("input your job :")
 4 salary = input("input your salary :")
 5 
 6 info = '''
 7 ----------info of {_name}--------------
 8 Name:{_name}
 9 Age:{_age}
10 job:{_job}
11 salary:{_salary}
12 '''.format(_name=name,
13            _age=age,
14            _job=job,
15            _salary=salary)
16 print(info)






二、条件判断表达式if...else...


1.双分支（if...else...）




name = input("input your name ")
pwd =  input("input your password ")

if name == "liyu" and pwd == "123":
    print("welcome login,liyu !")
else:
    print("username or password is error !")




2.多分支（if...elif...else...）




age = int(input("can you guess my age "))

if age == 25:
    print("It's a secret !")
elif age > 25:
    print("please smaller")
else:
    print("please older")





三、循环表达式


1.while


#输出三次内，正确退出，若三次错误提示，是否继续，输入n退出，其他非n字符则赋值count=0,，继续循环三次




my_age = int(25)
count = 0
while count <3:
    age = int(input("guess age: "))
    if age == my_age:
        print("ok")
        break
    elif age > my_age:
        print("input smaller , please")
    else:
        print("input older ," )
    count +=1
    if count ==3:
        continue_confirm = input("do you want continue ?")
        if continue_confirm != "n":
            count = 0





2.for


#range(10)中，10为序列长度，初始化值默认为0，步长为1




for i in range(10):
    if i == 16:
        break
    else:
        print(i)
else:
    print("break...")





#当遇到不正常退出（break）时，则程序不执行while所对应的else下的代码，只有当for循环体中代码正常执行的时，才执行else中的代码　　


#range(1,10,2)中0为初始化值，10为序列长度，2为步长




for i in range(0,10,2):
    if i == 6:
        break
    else:
        print(i)
else:
    print("break...")





3.continue、break和exit()


（1）continue是结束本次循环，跳到下一循环




for i in range(10):
    if i == 6:
        continue
    else:
        print(i)
else:
    print("break...")





　　


（2）break结束当前循环层




for i in range(10):
    if i == 6:
        break
    else:
        print(i)
else:
    print("break...")





　　


（3）exit()退出整个程序




for i in range(10):
    if i == 6:
        exit()
    else:
        print(i)
else:
    print("break...")





　　


　


　　





















		

		
posted @ 
2017-03-16 15:33 
larlly 
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