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Python: Check if a given list is strictly increasing or not

Python List: Exercise - 161 with Solution

Write a Python program to check if a given list increases strictly. Moreover, if removing only one element from the list results in a strictly increasing list, we still consider the list true.

Sample Solution:

Python Code:

# Source: https://bit.ly/3qZqcwm
def almost_increasing_sequence(sequence):
    if len(sequence) < 3:
        return True

    a, b, *sequence = sequence
    skipped = 0
    for c in sequence:
        if a < b < c:  # XXX
            a, b = b, c
            continue
        elif b < c:    # !XX
            a, b = b, c
        elif a < c:    # X!X
            a, b = a, c
        skipped += 1
        if skipped == 2:
            return False
    return a < b

print(almost_increasing_sequence([]))
print(almost_increasing_sequence([1]))
print(almost_increasing_sequence([1, 2]))
print(almost_increasing_sequence([1, 2, 3]))
print(almost_increasing_sequence([3, 1, 2]))
print(almost_increasing_sequence([1, 2, 3, 0, 4, 5, 6]))
print(almost_increasing_sequence([1, 2, 3, 0]))
print(almost_increasing_sequence([1, 2, 0, 3]))
print(almost_increasing_sequence([10, 1, 2, 3, 4, 5]))
print(almost_increasing_sequence([1, 2, 10, 3, 4]))
print(almost_increasing_sequence([1, 2, 3, 12, 4, 5]))

print(almost_increasing_sequence([3, 2, 1]))
print(almost_increasing_sequence([1, 2, 0, -1]))
print(almost_increasing_sequence([5, 6, 1, 2]))
print(almost_increasing_sequence([1, 2, 3, 0, -1]))
print(almost_increasing_sequence([10, 11, 12, 2, 3, 4, 5]))

Sample Output:

True
True
True
True
True
True
True
True
True
True
True
False
False
False
False
False

Pictorial Presentation:

Python List: Check if a given list is strictly increasing or not.
Python List: Check if a given list is strictly increasing or not.
Python List: Check if a given list is strictly increasing or not.

Flowchart:

Flowchart: Remove first specified number of elements from a given list satisfying a condition.

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 remove first specified number of elements from a given list satisfying a condition.
Next: Write a Python program to find the last occurrence of a specified item in a given list.

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Python: Tips of the Day

Returns True if the provided function returns True for every element in the list, False otherwise:

Example:

def tips_every(lst, fn=lambda x: x):
  return all(map(fn, lst))

print(tips_every([2, 4, 3], lambda x: x > 1))
print(tips_every([1, 2, 3]))

Output:

True
True