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# Assignment 3

"""

Given a list of ints, return True if the sequence of numbers 1, 2, 3

appears in the list anywhere, false otherwise.

sequence([1, 1, 2, 3, 1]) → True

sequence([1, 1, 2, 4, 1]) → False

sequence([1, 1, 2, 1, 2, 3]) → True

sequence([1, 2]) → False

sequence([]) → False

"""

def sequence(num_list):

for i in range(len(num_list)-2):

if num_list[i] == 1 and num_list[i+1] == 2 and num_list[i+2] == 3:

return True

return False

print(sequence([]))

# Solution:

# def sequence(num_list):

# # Note: iterate with length-2, so can use i+1 and i+2 in the loop

# for i in range(len(num_list) - 2):

# if num_list[i] == 1 and num_list[i + 1] == 2 and num_list[i + 2] == 3:

# return True

# return False