String.format()方法 (String.format() Method)

format() method is used to format the string (in other words - we can say to achieve the functionality like printf() in C language).

format()方法用于格式化字符串(换句话说，我们可以说实现了C语言中类似于printf()的功能)。

When we need to display the values of the variables inside the string, we can format it by placing {} where we want to place the value. {} is a replacement field, that replaces with the given value in format() method.

当需要在字符串中显示变量的值时，可以通过将{}放在要放置值的位置来设置其格式。 {}是一个替换字段，它用format()方法中的给定值替换。

The field {} contains the index to replace, the value specified in the format function.

字段{}包含要替换的索引，即格式函数中指定的值。

Let suppose, there are three values specified in the format method, {0} for the first value, {1} for the second value and {2} for the third value and so on will be used.

让假设，存在用于对所述第三值的第二值和{2}等将被使用的格式方法中指定三个值，{0}为所述第一值，{1}。

Syntax:

句法：

String.format(parameter1, parameter2,...)

Here, parameter1, parameter2, ... are the values/variables that will print within the string by replacing the field {N}. Where N is the index of the parameter.

在这里， parameter1，parameter2，...是通过替换字段{N}将在字符串中打印的值/变量。 其中N是参数的索引。

Example:

例：

print "{0}, {1} and {2}".format("ABC", "PQR", "XYZ")    This statement will print "ABC, PQR, and XYZ"

Example program 1: (printing name, age in different output formats)

示例程序1 ：(打印名称，使用不同输出格式的年龄)

# printing nameprint "My name is {0}".format("Amit")# printing name and age print "My name is {0}, I am {1} years old".format ("Amit", 21)# printing name and age through variablesname = "Amit"age = 21print "My name is {0}, I am {1} years old".format (name,age)

Output

输出量

My name is Amit    My name is Amit, I am 21 years old    My name is Amit, I am 21 years old

Example program 2: (Calculating SUM, AVERAGE, and printing in different output formats)

示例程序2 ：(计算SUM，AVERAGE和以不同的输出格式进行打印)

a = 10b = 20sum = a+b# output 1print "sum = {0}".format (sum)# output 2print "Sum of {0} and {1} is = {2}".format (a, b, sum)# finding average and printing a = 11b = 20sub = a+bprint "Average of {0} and {1} is = {2}".format (a, b, float(sum)/2)

Output

输出量

sum = 30    Sum of 10 and 20 is = 30    Average of 11 and 20 is = 15.0

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