d = format(123456, '10,d') # use seperator
print(d) # 123,456

n = format(3.1415925, '3.2f') # set precision
print(type(n), n) # 3.14

s = format('Hello', '>10s') # right align
print(s, '|') #     Hello |
		

# string
str = "String: %s %s" % ('One', 'Two')

str = "String: %10s %10s" % ('One', 'Two') #       One       Two

str = "String: %-10s %-10s" % ('One', 'Two') #One       Two       

str = "String: %10.2s %10.2s" % ('One', 'Two') #        On        Tw

# number
str = "Number: %d %f" % (10, 3.14) # 10 3.140000

str = "Number: %10d %10.2f" % (10, 3.14) #      10      3.14

str = "Number: %010d %010.2f" % (10, 3.14) #0000000010 0000003.14

# named placeholder
d = {'name':'Lin', 'age':37}
str = "%(name)s %(age)d" % d
		

# string
str = "String: {} {}".format('One', 'Two')  # One Two
 
str = "String: {1} {0}".format('One', 'Two') # Two One
 
str = "String: {:>10} {:>10}".format('One', 'Two') #       One       Two
 
str = "String: {:^10} {:^10}".format('One', 'Two'); #    One       Two
 
str = "String: {:<10} {:<10}".format('One', 'Two') # One       Two
 
str = "String: {:_<10} {:_<10}".format('One', 'Two') # One_______ Two_______

str = "Integer: {:_=+10} {:_=+10}".format(10, 100) # +_______10 +______100
 
str = "String: {:>10.2} {:>10.2}".format('One', 'Two') #        On        Tw
 
# number
str = "Number: {:d} {:f}".format(10, 3.14) # 10 3.140000
 
str = "Number: {:10d} {:10.2f}".format(10, 3.14) #      10      3.14
 
str = "Number: {:010d} {:010.2f}".format(10, 3.14) #0000000010 0000003.14
 
# named placeholder
d = {'name':'Lin', 'age':37}
str = "{name} {age}".format(**d)

# format string
name = 'Lin'
str = f'Name: {name}' # Name: Lin

# accessing arguments by name
str = 'Name: {fname}, {lname}'.format(fname='Lin', lname='Chen') # Name: Lin, Chen

str = 'Name: {{Hello}} {fname}, {lname}'.format(fname='Lin', lname='Chen') # Name: {Hello} Lin, Chen

# converting the value to different bases
str = "int: {0:d};  hex: {0:x};  oct: {0:o};  bin: {0:b}".format(42) # int: 42;  hex: 2a;  oct: 52;  bin: 101010
		

• Python 3 Library
• pyFormat