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November 11, 2021 17:20
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CS145 Midterm Review #2: 17b_notes.py
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| # 17b_notes.py | |
| ## Recursion Breakdown | |
| def countdown(n: int): | |
| print("begin: countdown(",n,")") | |
| if n == 0: | |
| print("output:\t\tBlastoff!") | |
| else: | |
| print("before:\t\t", n) | |
| countdown(n-1) | |
| print("after:\t\t", n) | |
| print("finish: countdown(",n,")") | |
| def q9(): | |
| items = [1,2,3,7,4,7] | |
| k = 0 | |
| while k < len(items): | |
| if items[k] == 7: | |
| print(items[k]) | |
| k += 1 | |
| print("---") | |
| for k in range(len(items)): | |
| if items[k] == 7: | |
| print(items[k]) | |
| print("---") | |
| for it in items: | |
| if it == 7: | |
| print(it) | |
| def for_loops(): | |
| stuff = [1,2,3,4,7,3] | |
| output = [] | |
| for name in stuff: | |
| if name == 7: | |
| output.append(name) | |
| break | |
| print(output) | |
| def factors(n): | |
| keep = [] | |
| for i in range(1, n+1): | |
| if n % i == 0: | |
| keep.append(i) | |
| return keep | |
| def is_prime(n): | |
| return factors(n) == [1,n] | |
| def line_count_file(file_name): | |
| with open(file_name, 'r') as file_var: | |
| total = 0 | |
| for line in file_var: | |
| total += 1 | |
| continue | |
| return total | |
| def is_sorted(xs): | |
| for i in range(len(xs)-1): | |
| if xs[i] > xs[i+1]: | |
| return False | |
| return True | |
| def sort_if_needed(xs): | |
| if is_sorted(xs): | |
| return xs | |
| xs.sort() | |
| return xs | |
| def loops(): | |
| numbers = [11, 2, 33, 4, 55, 6, 77, 8, 99] | |
| for x in numbers: | |
| if x < 11: | |
| continue | |
| if x > 50: | |
| break | |
| print(x * 10) | |
| def aliasing_example(): | |
| def add_c_to_list(second): | |
| second.append("c") | |
| first = ["a", "b"] | |
| # second = first | |
| # second.append("c") | |
| add_c_to_list(first) | |
| print(first) |
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