When trying to print a type in a formatted string with padding TypeError is raised. See examples below.

These work:
>>> a = 'abc'
>>> print('{a}'.format(a=type(a)))
<class 'str'>
>>> print('{a}'.format(a=str(type(a))))
<class 'str'>

These don't:
>>> print('{a: >10}'.format(a=type(a)))
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: unsupported format string passed to type.__format__
>>> t = type(a)
>>> print('{a: >10}'.format(a=t))
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: unsupported format string passed to type.__format__