An in-depth explanation of Python string formatting

The string formatting operator (%) is very similar to the string formatting of the printf() function in the C language. Even the symbols used are the same, using the percent sign (%), and supports all printf() formatting operations. The syntax is as follows:

format_string % string_to_convert

format_string is the format mark string, in the form of "%cdoe"; string_to_convert is the string to be formatted. If there are more than two, they need to be enclosed in parentheses.

String formatted output example:

charA = 65
charB = 66
print("ASCII码65代表：%c" % charA)
print("ASCII码66代表：%c" % charB)
Num1 = 0xEF3
Num2 = 0xAB03
print('转换成十进制分别为：%u和%u' % (Num1, Num2))
Num3 = 1500000
print('转换成科学计数法为：%e' % Num3)

Output:

ASCII code 65 represents: A

ASCII code 66 represents: B

converted to decimal: 3827 and 43779

converted to scientific notation The method is: 1.200000e+06

Formatting characters can also be used together with auxiliary symbols, which is very convenient.

Auxiliary symbols, as shown in the following table:

Example of auxiliary symbols:

Num1 = 108
print("%#X" % Num1)
Num2 = 234.567890
print("%.2f" % Num2)

Output:

0X6C

234.57