# Using Methods

1.

a.`'HELLO'`
b.`'happy birthday!'`
c.`'wEEEeeeeEEEeeeeEEE'`
d.`True`
e.`1`
f.`True`
g.`False`
h.`'Hello Python'`
i.`'Hello Python! Hello World!'`

2. `'tomato'.count('o')`

3. `'tomato'.find('o')`

4. `'tomato'.find('o', 'tomato'.find('o') + 1)`

5. `'avocado'.find('o', 'avocado'.find('o') + 1)`

6. `'runner'.replace('n', 'b')`

7. `strip`

8. a. `fruit.count('p')` then `fruit.find('p', 3)`
b. `fruit.upper()` then `'PINEAPPLE'.swapcase()` then `fruit.count('pineapple')`
c. `fruit.swapcase()` then `fruit.lower()` then `fruit.replace('PINEAPPLE', 'pineapple')`

9. `'I love {0}!'.format(season)`

10. `'The sides have lengths {0}, {1}, and {2}.'.format(side1, side2, side3)`

11.

a.`'boolean'.capitalize()`
b.`'C02 H20'.find('0')`
c.`'C02 H20'.find('0', 'C02 H20'.find('0') + 1)`
d.
e.
f.

12.

```def total_occurrences(s1, s2, ch):
""" (str, str, str) -> int

Precondition: len(ch) == 1

Return the total number of times that ch occurs in s1 and s2.

>>> total_occurrences('color', 'yellow', 'l')
3
>>> total_occurrences('red', 'blue', 'l')
1
>>> total_occurrences('green', 'purple', 'b')
0
"""
return s1.count(ch) + s2.count(ch)
```