Place A 0 In Front Of Numbers In A List If They Are Less Than Ten (in Python)

Write a Python program that will ask the user to enter a string of lower-case characters and then print its corresponding two-digit code. For example, if the input is 'home', the

Solution 1:

output.append("%02d" % number) should do it. This uses Python string formatting operations to do left zero padding.

Solution 2:

Or, use the built in function designed to do this - zfill():

defword ():
    # could just use a str, no need for a list:
    output = ""
    input = raw_input("please enter a string of lowercase characters: ").strip()
    for character ininput:
        number = ord(character) - 96# and just append the character code to the output string:
        output += str(number).zfill(2)
    # print outputreturn output


print word()
please enter a string of lowercase characters: home
08151305

Solution 3:

output = ["%02d" % n for n inoutput]
printoutput

['01', '02', '03', '04', '05', '06', '07', '08', '09', '10', '11', '12', '13', '14', '15', '16', '17', '18', '19', '20', '21', '22', '23', '24', '25', '26']

Python has a string formatting operation that works much like sprintf in C and other languages. You give your data as well as a string representing the format you want your data it. In our case, the format string ("%02d") just represents an integer (%d) that is 0-padded up to two characters (02).

If you just want to display the digits and nothing else, you can use the string .join() method to create a simple string:

print" ".join(output)

01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26

Solution 4:

Note, after the release of Python 3 using % formatting operations is on the way out, according to the Python standard library docs for 2.7. Here's the docs on string methods; have a look at str.format.

The "new way" is:

output.append("{:02}".format(number))