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(換句話說，我們可以說實(shí)現(xiàn)了C語言中類似于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.

當(dāng)需要在字符串中顯示變量的值時(shí)，可以通過將{}放在要放置值的位置來設(shè)置其格式。 {}是一個(gè)替換字段，它用format()方法中的給定值替換。

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

字段{}包含要替換的索引，即格式函數(shù)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.

讓假設(shè)，存在用于對(duì)所述第三值的第二值和{2}等將被使用的格式方法中指定三個(gè)值，{0}為所述第一值，{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.

在這里， parameter1，parameter2，...是通過替換字段{N}將在字符串中打印的值/變量。 其中N是參數(shù)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 ：(打印名稱，使用不同輸出格式的年齡)

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

Output

輸出量

My name is AmitMy name is Amit, I am 21 years oldMy 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 ：(計(jì)算SUM，AVERAGE和以不同的輸出格式進(jìn)行打印)

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

Output

輸出量

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

翻譯自: https://www.includehelp.com/python/string-format-method-with-example.aspx

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