Question

I want to print a staircase like pattern using .format() method. I tried this,

for i in range(6, 0, -1):
    print("{0:>"+str(i)+"}".format("#"))

但它给我带来了以下错误:

ValueError: Single  }  encountered in format string

基本想法是印刷

     #
    #
   #
  #
 #
#

具有类似准则的

for i in range(6, 0, -1):
    print("{0:>i}".format("#"))

Answer 1

目前,你的法典解释如下:

for i in range(6, 0, -1):
    print ( ("{0:>"+str(i))     +     ("}".format("#")))

因此,形式说明是单一“}”构造的,不正确。你们需要:

for i in range(6, 0, -1):
    print(("{0:>"+str(i)+"}").format("#"))

您所希望的工作:

================ RESTART: C:/Users/Desktop/TES.py ================
     #
    #
   #
  #
 #
#
>>>

Answer 2

Use f-strings

for i in range(6, 0, -1): 
    print(f"{ # :>{i}}")

产出:

     #
    #
   #
  #
 #
#

or Use format (instead of concatenating strings)

for i in range(6, 0, -1): 
    print("{0:>{1}}".format("#", i))

产出:

>>> for i in range(6, 0, -1): print("{0:>{1}}".format("#", i))

     #
    #
   #
  #
 #
#