str函数在Python python中str函数用法

python中的str函数

上面那个是做合并加法+时的转换，返回的数据如果是整数序列，序列的加法就成了新增整型，并引起错误。而需要的是字符串的合并。

下面由于print打印函数默认会对最终输入的对象进行repr()字符表示化处理，所以不需要再次转换字符串

相关问答

Q1: python str函数怎么用？

是将一个对象转成字符串显示str函数在Python，注意只是显示用str函数在Python，有些对象转成字符串没有直接的意思。

str():将变量转化为字符串类型

a = 1

b = [1, 2, 3]

str_a = str(a)

print(a)

print(type(a))

str_b = str(b)

print(b)

print(type(b))

The str() function is meant to return representations of values which are fairly human-readable, while repr() is meant to generate representations which can be read by

the interpreter (or will force a SyntaxError if there is not equivalent syntax). For objects which don't have a particular representation for human consumption, str() will

return the same value as repr(). Many values, such as numbers or structures like lists and dictionaries, have the same representation using either function. Strings and。

Q2: python str函数怎么用

是将一个对象转成字符串显示，注意只是显示用，有些对象转成字符串没有直接的意思。

str():将变量转化为字符串类型

a = 1

b = [1, 2, 3]

str_a = str(a)

print(a)

print(type(a))

str_b = str(b)

print(b)

print(type(b))

The str() function is meant to return representations of values which are fairly human-readable, while repr() is meant to generate representations which can be read by

the interpreter (or will force a SyntaxError if there is not equivalent syntax). For objects which don't have a particular representation for human consumption, str() will

return the same value as repr(). Many values, such as numbers or structures like lists and dictionaries, have the same representation using either function. Strings and。

Q3: str在python中用法

Python中的str可以表示字符串类，也可以是将变量强制转换为字符串的函数，写作str()。str函数是Python内置函数的一种，可以直接使用，无需调用。 扩展资料

python中srt的全称是SubRip Text，srt文件打开方式srt文件可以使用系统自带的.文本处理器来打开，比如notepad.exe,write.exe,word等文件处理软件。在Python中，str 表示字符串类 ，也可以是将变量强制转换为字符串的函数，写作str()。

Q4: 菜鸟求大大们解释Python里str函数和repr函数的区别

简单来说

str()将数值转成字符串

repr()将对象转成字符串显示，注意只是显示，有些对象转成字符串没有意义。如list,dict使用str()是无效的，但使用repr可以，这是为了显示他们的值

以下内容摘自google

The str() function is meant to return representations of values which are fairly

human-readable, while repr() is meant to generate representations which can be read by the interpreter (or will force a SyntaxError if there is not equivalent syntax). For

objects which don't have a particular representation for human consumption, str() will

return the same value as repr(). Many values, such as numbers or structures like lists

and dictionaries, have the same representation using either function. Strings and

floating point numbers, in particular, have two distinct representations.

Some examples:

s = 'Hello, world.'

str(s)

'Hello, world.'

repr(s)

"'Hello, world.'"

str(0.1)

'0.1'

repr(0.1)

'0.10000000000000001'

x = 10 * 3.25

y = 200 * 200

s = 'The value of x is ' + repr(x) + ', and y is ' + repr(y) + '...'

print s

The value of x is 32.5, and y is 40000...

# The repr() of a string adds string quotes and backslashes:

hello = 'hello, world\n'

hellos = repr(hello)

print hellos

'hello, world\n'

# The argument to repr() may be any Python object:

repr((x, y, ('spam', 'eggs')))

"(32.5, 40000, ('spam', 'eggs'))"

# reverse quotes are convenient in interactive sessions:

`x, y, ('spam', 'eggs')`

"(32.5, 40000, ('spam', 'eggs'))"

Q5: python中的__str__函数作用

__str__方法：总结

在python中方法名如果是__xxxx__()的，那么就有特殊的功能，因此叫做“魔法”方法，当使用print输出对象的时候，只要自己定义了__str__(self)方法，那么就会打印从在这个方法中return的数据

例子1：如：

class Car:

    def __init__(self, newWheelNum, newColor):

        self.wheelNum = newWheelNum

        self.color = newColor

    def __str__(self):

        msg = "嘿。。。我的颜色是" + self.color + "我有" + int(self.wheelNum) + "个轮胎..."

        return msg

    def move(self):

        print('车在跑，目标:夏威夷')

BMW = Car(4, "白色")

print(BMW)

例子2：如：

class Cat:

    """定义了一个Cat类"""

    #初始化对象

    def __init__(self, new_name, new_age):

        self.name = new_name

        self.age = new_age

    def __str__(self):

        return "%s的年龄是:%d"%(self.name, self.age)

    #方法

    def eat(self):

        print("猫在吃鱼....")

    def drink(self):

        print("猫正在喝kele.....")

    def introduce(self):

        print("%s的年龄是:%d"%(self.name, self.age))

#创建一个对象

tom = Cat("汤姆", 40)

lanmao = Cat("蓝猫", 10)

print(tom)

print(lanmao)

运行结果：

汤姆的年龄是:40

蓝猫的年龄是:10

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