my_string = "Python learn code test fun amazing object oriented"

sub_string = "object"

print("字符串为：" )
print(my_string)

print("子字符串为：" )
print(sub_string)

my_result = [index for index in range(len(my_string)) if my_string.startswith(sub_string, index)]

print("结果字符串为：")
print(my_result)

字符串为：
Python learn code test fun amazing object oriented
子字符串为：
object
结果字符串为：
[35]