# Python: Geometric progression

## Python List: Exercise - 244 with Solution

Write a Python program to initialize a list containing the numbers in the specified range where start and end are inclusive and the ratio between two terms is step. Return an error if step equals 1.

- Use range(), math.log() and math.floor() and a list comprehension to create a list of the appropriate length, applying the step for each element.
- Omit the second argument, start, to use a default value of 1.
- Omit the third argument, step, to use a default value of 2.

**Sample Solution:**

**Python Code:**

```
from math import floor, log
def geometric_progression(end, start=1, step=2):
return [start * step ** i for i in range(floor(log(end / start)
/ log(step)) + 1)]
print(geometric_progression(256))
print(geometric_progression(256, 3))
print(geometric_progression(256, 1, 4))
```

Sample Output:

[1, 2, 4, 8, 16, 32, 64, 128, 256] [3, 6, 12, 24, 48, 96, 192] [1, 4, 16, 64, 256]

**Flowchart:**

## Visualize Python code execution:

The following tool visualize what the computer is doing step-by-step as it executes the said program:

**Python Code Editor:**

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**Previous:** Write a Python program to check if a given function returns True for every element in a list.

**Next:** Write a Python program to that takes any number of iterable objects or objects with a length property and returns the longest one.

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## Python: Tips of the Day

**Given a predicate function, fn, and a prop string, this curried function will then take an object to inspect by calling the property and passing it to the predicate:**

Example:

def tips_check_prop(fn, prop): return lambda obj: fn(obj[prop]) check_age = tips_check_prop(lambda x: x >= 25, 'age') user = {'name': 'Owen', 'age': 25} print(check_age(user))

Output:

True

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