The assignment operator has lower precedence than &&, so your condition is equivalent to: But the left-hand side of this is an rvalue, namely the boolean resulting from the evaluation of the subexpression match == 0 && k, so you cannot assign to it. By contrast, comparison has higher precedence, so match == 0 && k == m is … Read more
if is the statement. not start is the expression, with not being a boolean operator. not returns True if the operand (start here) is considered false. Python considers all objects to be true, unless they are numeric zero, or an empty container, or the None object or the boolean False value. not returns False if start is a true value. See the Truth Value Testing section in the documentation. So if start is None, then indeed not start will be true. start can also be 0, or … Read more
Python does not have a trailing if statement. There are two kinds of if in Python: if statement: if condition: statement if condition: block if expression (introduced in Python 2.5) expression_if_true if condition else expression_if_false And note, that both print a and b = a are statements. Only the a part is an expression. So … Read more
That’s more specifically a ternary operator expression than an if-then, here’s the python syntax Better Example: (thanks Mr. Burns) ‘Yes’ if fruit == ‘Apple’ else ‘No’ Now with assignment and contrast with if syntax vs
[[ has fewer surprises and is generally safer to use. But it is not portable – POSIX doesn’t specify what it does and only some shells support it (beside bash, I heard ksh supports it too). For example, you can do to test whether a file exists. But with [, you have to quote $b, … Read more
maybe you want ifelse:
You would want and instead of &&.
No, it will not be evaluated. And this is very useful. For example, if you need to test whether a String is not null or empty, you can write: or, the other way around If we didn’t have ‘short-circuits’ in Java, we’d receive a lot of NullPointerExceptions in the above lines of code.
Here’s pig latin dialect that takes into account how the words are pronounced: Output “Pig qoph an egg.” → “igpay ophqay anway eggway.” “Quiet European rhythms.” → “ietquay uropeaneay ythmsrhay.” “My nth happy hour.” → “ymay nthway appyhay hourway.” “Herb unit — a dynasty heir.” → “herbway itunay — away ynastyday heirway.” Note: “-way” suffix … Read more