w = ['анна', 'михаил', 'глеб', 100, 2.5]
q = [i.title() if isinstance(i, str) else i in w for i in w]
print(q)

 ['Анна', 'Михаил', 'Глеб', True, True]

 q = [i.title() if isinstance(i, str) else i for i in w]

  
>>> lst = ['анна', 'михаил', 'глеб', 100, 2.5]
>>> 
>>> out = [(isinstance(i, str) and i.title()) or i for i in lst]
>>> out
['Анна', 'Михаил', 'Глеб', 100, 2.5]
>>>