string

st='hello kitty (name) is (age)'
print(st.count('l'))#数字符个数
print(st.capitalize())#首字母大写
print(st.center(50,'-'))#居中
print(st.endswith('y'))
print(st.startswith('y'))
print(st.find('t'))
print(st.format(name='alex'))#替换
print(st.format_map({'name':'weq','age':36}))