我想打印一个字母模式，如果有什么东西可以即兴创作我用 python 编写的代码

Question

Below is the code, I would like if someone could improve this code further:

i=0


while i<4:

    if i==0:
        print()
        print(chr(65),end="")
        i=i+1
    if i==1:
        print()
        print(chr(65) ,end="")
        print(chr(66) ,end="")
        i=i+1
    if i==2:
        print()
        print(chr(65), end="")
        print(chr(66), end="")
        print(chr(67), end="")
        i=i+1

    if i==3:
        print()
        print(chr(65), end="")
        print(chr(66), end="")
        print(chr(67), end="")
        print(chr(68), end="")
        i=i+1

output:

A
AB
ABC
ABCD

Answer 1

Just use two for loops:

for w in range(5):
  for c in range(w):
    print(chr(65+c), end="")
  print()

The outer loop if for the length of the line and the inner for the characters.

Answer 2

You can use two for loops. 1st loop for controlling the number of char you want in each line. 2nd loop prints characters.

Try this.

for i in range(4):
    for j in range(65,i+66):
        print(chr(j),end='')
    print()

Answer 3

Let me show you how you can use a FOR LOOP correctly. I'm going to use my own exercise and then YOU find a way to implement it into your code.

VARIABLES As you know, variables can be assigned many many different values. Of which, can be made into a list .

LISTS So if I wanted to create a grocery list I could write the code as follows: grocery_list = ["Apples", "Bananas", "Gummy Bears"]

So now the variable grocery_list is equal to 3 separate strings.

FOR LOOPS Now to do something to each item on that list , (or any list for that matter) we use something called a for loop . The for loop creates only one temporary variable to be used for each item in your list in order.

Now listen carefully, this may be clear in a second.

Once the first item (which is assigned to a temporary variable ) is done, it moves on to the second item by assigning it to the same temporary variable , effectively overwriting it.

Here is the syntax of the for loop followed by a more plain English translation.

for every_item in my_list:
    do_this

Translates to this:

"For every_item (one at a time, in order)
in my_list (that I've already created):
do the following with those items
which are assigned to the
variable, 'each_item'."

So if I wanted to print out all of the items in my grocery_list , I can reference the plain English and regular syntax examples I've written earlier.

for each_item in grocery_list:
    print(each_item)

"For every single item, in order, assign that particular item to this variable , and then print that variable ."

And again just to emphasize:

"For every single item, (both in order AND only one at a time) assign to the FIRST item in the list to THIS variable I've decided to call: each_item. THEN, repeat for the SECOND item, followed by the third item and so on."

One more example Maybe with those items in my list , I want to show that I have already purchased them. In that case I could write:

for each_item in grocery_list:
    print(each_item + " purchased)

For loops are so ingrained in programming it's not even funny. So please make sure that you read up as much as you can. Hope this helped.