In Python 2 (and Python 3) you can do:
number = 1
print("%02d" % (number,))
Basically % is like printf
or sprintf
.
For Python 3.+, the same behavior can also be achieved with format
:
number = 1
print("{:02d}".format(number))
Learn more about format and f-strings from this article on Python strings.
For Python 3.6+ the same behavior can be achieved with f-strings:
number = 1
print(f"{number:02d}")
How to display number with leading zeros in Python?
You can use str.zfill
:
print(str(1).zfill(2))
print(str(10).zfill(2))
print(str(100).zfill(2))
prints:
01
10
100
Answer #3:
In Python 2.6+ and 3.0+, you would use the format()
string method:
for i in (1, 10, 100):
print('{num:02d}'.format(num=i))
or using the built-in (for a single number):
print(format(i, '02d'))
Answer #4:
print('{:02}'.format(1))
print('{:02}'.format(10))
print('{:02}'.format(100))
prints:
01
10
100
Answer #5:
In Python >= 3.6, you can do this succinctly with the new f-strings that were introduced by using:
f'{val:02}'
which prints the variable with name val
with a fill
value of 0
and a width
of 2
.
For your specific example you can do this nicely in a loop:
a, b, c = 1, 10, 100
for val in [a, b, c]:
print(f'{val:02}')
which prints:
01
10
100
Answer #6:
The Pythonic way to do this:
str(number).rjust(string_width, fill_char)
This way, the original string is returned unchanged if its length is greater than string_width. Example:
a = [1, 10, 100]
for num in a:
print str(num).rjust(2, '0')
Results:
01
10
100
Answer #7:
This is how I do it:
str(1).zfill(len(str(total)))
Basically zfill takes the number of leading zeros you want to add, so it’s easy to take the biggest number, turn it into a string and get the length, like this:
Python 3.6.5 (default, May 11 2018, 04:00:52) [GCC 8.1.0] on linux Type "help", "copyright", "credits" or "license" for more information. >>> total = 100 >>> print(str(1).zfill(len(str(total)))) 001 >>> total = 1000 >>> print(str(1).zfill(len(str(total)))) 0001 >>> total = 10000 >>> print(str(1).zfill(len(str(total)))) 00001 >>>
Answer #8:
All of these create the string “01”:
>python -m timeit "'{:02d}'.format(1)"
1000000 loops, best of 5: 357 nsec per loop
>python -m timeit "'{0:0{1}d}'.format(1,2)"
500000 loops, best of 5: 607 nsec per loop
>python -m timeit "f'{1:02d}'"
1000000 loops, best of 5: 281 nsec per loop
>python -m timeit "f'{1:0{2}d}'"
500000 loops, best of 5: 423 nsec per loop
>python -m timeit "str(1).zfill(2)"
1000000 loops, best of 5: 271 nsec per loop
>python
Python 3.8.1 (tags/v3.8.1:1b293b6, Dec 18 2019, 23:11:46) [MSC v.1916 64 bit (AMD64)] on win32
Hope you learned something from this post.
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