第02周学习提升建议：【python安装、变量、输入输出、流程、循环】--【第四篇】字符串和数字

一、字符串

删除右边的空白 str.rstrip() ，删除左边的空白 str.lstrip()，如果删除左边+右边的空格 str.strip()

#字符串大小写
myName = 'zhang san'
print(myName)
print(myName.upper())
print(myName.lower())
#把字符串修改为标题形式，首字母大写比如zhang san，都修改为Zhang San
print(myName.title())

#字符串拼接
hisName = 'li si'
print('hello! '+myName)
print('hello! '+hisName)

#删除空白
myName1 = '    wang  wu  '
print(myName1)
print(myName1.rstrip()+'.')
print(myName1.lstrip())
print(myName1.strip())

二、数字

#整数、浮点数、相互转换
a = 9
b = '2'
c = 2.0
print(a/int(b))
print(a%c)
print(a/float(b))
print(str(a)+b)

字符串格式化及格式化输出

#字符串 % s
print("Hello,%s" % "world")

#整数 % d
print("My age is %d" % 20)

#浮点数 % f
print("My age is %f" % 20)

 

格式化输出

name = input("what is your name:")
age = int(input("tell me you age:"))
job = input("job:")
salary = input("salary:")

info = '''
    ---- info of %s ------
    name:%s
    age:%d
    job:%s
    salary:%s''' % (name, name, age, job, salary)
print(info)

info2 = '''
    ---- info of {_name} ------
    name:{_name}
    age:{_age}
    job:{_job}
    salary:{_salary}
    '''.format(_name=name, _age=age, _job=job, _salary=salary)
print(info2)

info3 = '''
    ---- info of {0} ------
     name:{0}
     age:{1}
     job:{2}
     salary:{3}
     '''.format(name, age, job, salary)
print(info3)


执行后输入内容：

what is your name:zs
tell me you age:27
job:tester
salary:15000

    ---- info of zs ------
    name:zs
    age:27
    job:tester
    salary:15000

    ---- info of zs ------
    name:zs
    age:27
    job:tester
    salary:15000
    

    ---- info of zs ------
     name:zs
     age:27
     job:tester
     salary:15000