Homework 2

Send your homework as a single ZIP archive with your files, or send a link to your GitHub repo. Try to keep line lengths below 80 characters.

EXERCISE 2.1

Create a long positive integer. Find the number of zeros. Hint: change the number to a string.

EXERCISE 2.2 (BOOL)

# Explain the results.
x = 5
x == 5 and 3 + 8   # 11
x == 4 and 3 + 8   # False
3 + 8 and x == 5   # True
3 + 8 and x == 4   # False

isinstance(True, int)    # True
isinstance(True, bool)   # True

EXERCISE 2.3 (NUMBERS)

Find the sum 1*1 + 3*3 + 5*5 + ... + 2021*2021 [hint: use sum() and range()].

EXERCISE 2.4 (STR)

(a) Find Unicode code points (int) for all characters of your name.
Example: "Andrzej" --> [65, 110, 100, 114, 122, 101, 106]

(b) Prepare the periodic table (ten elements) as a list
pt = [(1,"Hydrogen","H",1), (2,"Helium","He",4), ...].
Use pt to print a table (3 right + 20 left + 6 center + 10 right)
+---+--------------------+------+----------+
|No.|Name (en)           |Symbol|Weight (u)|
+---+--------------------+------+----------+
|  1|Hydrogen            |  H   |         1|
|  2|Helium              |  He  |         4|
|   | ...                |      |          |
+---+--------------------+------+----------+
Hint: use the for loop:
for (n, name, symbol, weight) in pt:
    # use variables (n, name, symbol, weight) to create a proper line

EXERCISE 2.5 (LIST)

Let S be a long string (many lines).

Find the number of black characters in S [not whitespace, see the method S.isspace()].

Find the number of words in S (a word is a sequence of black characters).

Find the longest word in S.

Sort words from S according to (1) the lexicographic order, (2) the length.

EXERCISE 2.6 (TUPLE)

# Find and explain the results.
t = (2, 4)
print(t[2])
t.append(6)
a, b = t ; print(a, b)

EXERCISE 2.7 (DICT)

Create a dict for conversion of roman numerals/strings (I, IV, V, IX, X, XL, L, XC, C, CD, D, CM, M) to arabic numbers. Use different methods.