Python：如何打印出一定范围的字母

Question

I'm trying to make a Battleship grid, with numbers on the left and the letters on top. I'm confused on how you would print out a certain amount of letters and add them on with python. I'm an extremely new beginner when it comes to Python.

For example:

    def displayGrid(Rows,Columns):
        output = '| '
        for title in range(97,110):
            output = output + chr(title)
            output = output + ' |'
        print(output)

        for row in range(Rows):
            output = str(row + 1) + '| '
            for col in range(Columns):
                output = output + " | "
            print(output)

    Rows = int(input("Number of rows you want? \n"))
    Columns = int(input("Number of columns you want? \n"))

    displayGrid(Rows, Columns)

I want it so the number of Columns is the number of letters that it prints out but I can't seem to figure it out.

Answer 1

Your first loop ( for title in range(97,110): ) will always have a fixed length (of 110-97=13 elements), so you'll always end up with the same first line, regardless of how many columns you want.

Try something like for title in range(97, 97+Columns):

Answer 2

replace this

    for title in range(97,110):
        output = output + chr(title)
        output = output + ' |'
    print(output)

by

output = " |" +"|".join([chr(i) for i in range(97,97+Columns)])
print(output)

Answer 3

You can access the lowercase letters through

from string import lowercase

And a clean way to achieve your string would be:

result = "| " + " | ".join(lowercase[0:size]) + " |"

Answer 4

Few tips -

1. When you have an iteratable you want to print and join with certain delimiter you can use join - '|'.join(["a", "b", "c"]) a|b|c

2. from string import lowercase will give you a string (which you can iterate on) all the lower case letters.

3. Check python itertools - https://docs.python.org/2/library/itertools.html