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Outbyte PC Repair FREEClear out junk files and repair common Windows errorsFree Scan →Outbyte Driver Updater FREEScan for outdated or missing drivers - takes under a minuteDriver Scan →Use the explicit comparison variable > 0. It is true only when the value is strictly greater than zero.
Check whether a value is greater than zero
Put the comparison in an if statement to run code only for positive values:
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if variable > 0:
print("The value is greater than zero")The comparison evaluates to the Boolean value True or False. Since the test is strictly greater than zero, zero and negative values do not pass it. You can also save the result for later use:
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1Scan for outdated or missing drivers - takes under a minute2Repair Windows errors before they cause bigger problems3Fix the driver behind crashes, sound loss and screen glitchesis_positive = variable > 0Python documents comparison behavior in its language reference.
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Why if variable: is different
A bare condition such as if variable: checks whether the value is truthy; it does not check whether it is positive. Numeric zero is false in a Boolean context, but a negative nonzero number is true. As a result, a truthiness check would also accept negative numbers.
for variable in (5, 0, -3):
print(variable, variable > 0)This prints 5 True, 0 False, and -3 False. Use variable > 0 when the requirement is specifically to be greater than zero. Python describes truth-value testing in its built-in types documentation.
Make sure the value can be compared with zero
The value must support an ordering comparison with the integer 0. For example, Python does not order complex numbers with >; attempting that comparison raises TypeError. Other types may define their own comparison behavior, so the meaning depends on the value’s type.
When the value comes from input
input() returns text. Convert the text to an appropriate numeric type and handle invalid input before comparing it. For example, if a whole-number value is expected:
text = input("Enter a whole number: ")
try:
variable = int(text)
except ValueError:
print("Enter a valid whole number")
else:
if variable > 0:
print("The value is greater than zero")Do not compare a string such as "5" directly with integer 0 in Python 3; convert it first. Choose a conversion that matches the kind of numeric input your program expects.
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