Write a python program to print the number of occurrences of a substring into a line

Sure, here is a simple Python program that counts the number of occurrences of a substring in a string:

def count_substring(string, substring):
    return string.count(substring)

string = "Hello, world! This is a world full of surprises."
substring = "world"

print("The substring occurs", count_substring(string, substring), "times.")

In this program, we define a function count_substring that takes two arguments: the main string and the substring we want to count. The function uses the count method of the string to count the number of occurrences of the substring.

We then define a string and a substring, and print the number of occurrences of the substring in the string by calling our function.