TheAlgorithms/Python · error · TypeError

Input value must be a 'int' type

Error message

Input value must be a 'int' type

What it means

Raised by check_args() in physics/horizontal_projectile_motion.py when the angle argument is not an int or float. Same shared validator as the velocity check: it runs after the velocity type check, so a bad velocity raises first if both are wrong. Strings (e.g. '45'), None, and Decimals all trigger it.

Source

Thrown at bit_manipulation/binary_count_setbits.py:34

    >>> binary_count_setbits(0)
    0
    >>> binary_count_setbits(-10)
    Traceback (most recent call last):
        ...
    ValueError: Input value must be a positive integer
    >>> binary_count_setbits(0.8)
    Traceback (most recent call last):
        ...
    TypeError: Input value must be a 'int' type
    >>> binary_count_setbits("0")
    Traceback (most recent call last):
        ...
    TypeError: '<' not supported between instances of 'str' and 'int'
    """
    if a < 0:
        raise ValueError("Input value must be a positive integer")
    elif isinstance(a, float):
        raise TypeError("Input value must be a 'int' type")
    return bin(a).count("1")


if __name__ == "__main__":
    import doctest

    doctest.testmod()

View on GitHub (pinned to f5988cc097)

Solutions

1. Parse the angle to a plain float and strip unit suffixes before calling.
2. Default optional angles to a numeric value (e.g. 45.0) instead of None.
3. Catch TypeError and re-prompt / reject the input at the boundary.

Example fix

# before
dist = horizontal_distance(50, angle_str)  # '45deg' -> TypeError

# after
angle = float(angle_str.replace('deg', '').strip())
dist = horizontal_distance(50, angle)

if not isinstance(angle, (int, float)) or isinstance(angle, bool):
    raise TypeError(f"angle must be numeric, got {type(angle).__name__}")
dist = horizontal_distance(init_velocity, angle)

def is_numeric_angle(a: object) -> bool:
    return isinstance(a, (int, float)) and not isinstance(a, bool)

try:
    dist = horizontal_distance(v, angle)
except TypeError as e:
    if "angle" in str(e):
        dist = horizontal_distance(v, float(str(angle).strip().rstrip('deg°')))
    else:
        raise

When it happens

Trigger: horizontal_distance(50, '45'); horizontal_distance(50, None); passing an angle in radians as a sympy/Decimal object, or unparsed form input like '45deg'.

Common situations: Angles arriving as strings with units attached ('45 degrees', '45°') from user input; None defaults for optional angle parameters; angles stored as text in CSV columns.

Related errors

• Input value must be a positive integer
• Expected a list of numbers as input, found {type(item).__nam
• Expected a list of numbers as input, found {type(point).__na
• Input must be an integer
• Initial orbit radius must be greater than zero.

AI-assisted analysis of TheAlgorithms/Python@f5988cc097 (2026-08-14). Data as JSON: /api/errors/6cba003da863588f. Report an issue: GitHub.