如何提取单词首字母并大写

python里要怎么提取每个单词的首字母，并且将首字母都变成大写形式？
我这个程序要如何修改呢

s = 'yang zhou university:'
result = ''
for t in s.split():
    result = result + t.capitalize() + ' '
print(result)

str1 = ("yang zhou university:")
list1 = str1.split(" ")
result = []
for i in list1:
    result += i[0].upper()
print(result)