Table of contents
String formatting
common formatting characters
| format character |
illustrate |
| %s |
string (display using str()) |
| %r |
string (display using repr()) |
| %c |
single character |
| %b |
binary integer |
| %d |
decimal integer |
| %i |
decimal integer |
| %o |
octal integer |
| %x |
hexadecimal integer |
| %e |
Exponent (base written as e) |
| %E |
exponent (base written as E) |
| %f、%F、%F |
floating point number |
| %g |
exponent (e) or float (depending on display length) |
| %G |
exponent (E) or float (depending on display length) |
| %% |
character"%""%" |
example:
>>> x = 1235
>>> so="%o" % x
>>> so
"2323"
>>> sh = "%x" % x
>>> sh
"4d3"
>>> se = "%e" % x
>>> se
"1.235000e+03"
>>> chr(ord("3")+1)
"4"
>>> "%s"%65
"65"
>>> "%s"%65333
"65333"
>>> "%d"%"555" #试图将字符串转换为整数进行输出，抛出异常
TypeError: %d format: a number is required, not str
>>> int('555') #可以使用int（）函数将合法的数字字符串转换为整数
555
>>> '%s'%[1, 2, 3]
'[1, 2, 3]'
>>> str((1,2,3)) #可以使用str（）函数将任意类型数据转换为字符串
'(1, 2, 3)'
>>> str([1,2,3])
'[1, 2, 3]'
format() method
More flexible, not only can use the position for formatting, but also support the use of position-independent parameter names for formatting, and support sequence unpacking format strings
【 Example 1】
print("The number {0:,} in hex is: {0:#x}, the number {1} in oct is {1:#o}".format(5555,55))
output:
The number 5,555 in hex is:0x15b3, the number 55 in oct is 0o67
Parse:
{0:} or {0} represents a0 in format(a0,a1,a2), {0:#format character} means a0 is formatted
[Example 2]
print("my name is {name}, my age is {age}, and my QQ is {qq}".format(name = "Dong Fuguo",age = 37,qq = "306467355"))
output:
my name is Dong Fuguo, my age is 37, and my QQ is 306467355