Python string Formatting

1. Use%s to indicate

s ="welcome%s to login%s"%("Alex"," China")Print(s) s="welcome% (name) s to login% (city) s"%{"name":"Alex"," City":"Wuhan"}Print(s)

s = "%10s is%+10d years old"% ("Alex",-10)
Print (s)

Alex is-10 years old
Explanation: The first string accounted for 10 characters, right-aligned, the second also accounted for 10 characters, right-aligned, + number positive front plus +, negative before plus-.

s = "The pi is%.4f"% (3.1415926)
Print (s)
The pi is 3.1416
or the following notation.

s = "The Pi is% (p)." 4f "%{" P ": 3.1415926}

s = "The pi is ====%c=====%x======%o"% (65,15,15)
Print (s)
The pi is ====a=====f======17

s = "Alex percent percent"
Print (s)

S1 = "Alex%s%%%%"% ("SB")
Print (S1)

Output:

Alex is a percent.
Alex SB. Percent #一旦前面出现过% placeholder, followed by a percent only

2. Formatting with format

" ----->{0}------>{1}------>{0} ". Format ("Alex")print  (s)----->alex------ >10------>alex

s = "----->{name:s}------>{age:d}------>{name:s}". Format (name= "Alex", age=10)
Print (s)
----->alex------>10------>alex

s = "-----{: 9^20s}=====". Format ("Alex")
Print (s)
-----99999999alex99999999=====
Explanation: The string width is 20, centered, and the insufficient part is filled with 9来

S2 = "======{:* <20s}======{:+d}======{: #b}". Format (' Alex ', 123,15)
Print (s2)
======alex****************======+123======0b1111
Explanation: #号只是给b, o,x preceded by 0b,0o,0x symbol

S3 = "{:. 2%}". Format (0.234567)
Print (S3)
23.46%

s = "{} is {} years old". Format ("Alex", 18)
Print (s)

S1 = "{} is {} years old". Format (*["Alex", 18])
Print (S1)

S2 = "{name} is {age} years old". Format (**{"name": "Alex", "Age": 18})
Print (s2)

Python string Formatting