Python输出阶梯或金字塔图案

 1.输出：
$
$$
$$$
$$$$

height = int(input("请输入行数：\n"))
for i in range(height):
    for j in range(i+1):
        print("$ ", end='')
    print("\n")

2.获得一个大写字母（例如F），输出类似内容
F
FE
FED
FEDC
FEDCB
FEDCBA

theStr=input("please input the letter:\n")
theCode=ord(theStr)
for i in range(1,theCode-65+2):
    for j in range(theCode,theCode-i,-1):
        print(chr(j),end='')
    print("\n")

3.获得一个大写字母（例如F），输出类似内容：
           A
         ABA
       ABCBA
    ABCDCBA
  ABCDEDCBA
ABCDEFEDCBA

theStr = input('please input the letter:\n')
theCode = ord(theStr)
i = 65
while i <= theCode:
    for j in range(theCo