[Python] print formatting

Old Formatting

% formatting

print("my name is %s." % "hyun")
print("%d + %d = %d" %(100, 200, 300))
print("%5.5f" % 123.456) # "  123.45600"
print("%2.2f" % 123.456) # "23.45"

{} formatting

print("I am {0} years old" .format(20))
print("My name is {0} and this is {1}" .format("hyun", "my mom"))
print("pi is {0:.5f}" .format(pi)) # "pi is 3.14159"

padding, align, decimal places

{0:5s}
5 paddings
.5f
5 decimal places
>10d
align right, 10 paddings
<3.5f
align left, 3 paddings, 5 decimal digits

Recent formatting

f-string (PEP498)

name = "hyun"
age = 20
pi = 3.141592...
print(f"Hi, my name is {name} and {age} years old")
print(f"{pi:<3.5f")
print(f"{pi:@^10.5f") #빈 칸을 @로 채워준다. ^키워드는 가운데 정렬

바로 변수명을 적어주면 된다.