any([1 <= 2 <= 3, "a" in "letter"])

```

Note:

```{note}

* `all()` returns `True` when *all* boolean values/expressions in the sequence are `True`

* `any()` returns `True` when *any* boolean values/expressions in the sequence are `True`

```

## Coding Style and Documentation

(For some, the built-in function `sum()` comes in handy).

```{exercise}

```{exercise-start}

:label: pyess_ex1

```

Part 1: Given two numeric lists or tuples `x_vals` and `y_vals` of equal length, compute

their inner product using `zip()`.

Part 2: In one line, count the number of even numbers in 0,...,99.

* Hint: `x % 2` returns 0 if `x` is even, 1 otherwise.

Part 3: Given `pairs = ((2, 5), (4, 2), (9, 8), (12, 10))`, count the number of pairs `(a, b)`

such that both `a` and `b` are even.

```{hint}

:class: dropdown

`x % 2` returns 0 if `x` is even, 1 otherwise.

```

```{exercise-end}

```

```{solution-start} pyess_ex1

:class: dropdown

```

```

```{exercise}

```{exercise-start}

:label: pyess_ex3

```

Write a function that takes a string as an argument and returns the number of capital letters in the string.

Hint: `'foo'.upper()` returns `'FOO'`.

```{hint}

:class: dropdown

`'foo'.upper()` returns `'FOO'`.

```

```{exercise-end}

```

```{solution-start} pyess_ex3