python - One line if-condition-assignment - Stack Overflow
Oct 24, 2011 · One should not use this approach if looping through large data sets since it introduces an unnecessary assignment in case we end up in the else-statement.
python - How can I fix "UnboundLocalError: local variable referenced ...
This is because, even though Var1 exists, you're also using an assignment statement on the name Var1 inside of the function (Var1 -= 1 at the bottom line). Naturally, this creates a variable inside the …
python - What are assignment expressions (using the "walrus" or ...
117 Since Python 3.8, code can use the so-called "walrus" operator (:=), documented in PEP 572, for assignment expressions. This seems like a really substantial new feature, since it allows this form of …
python - How to assign a variable in an IF condition, and then return ...
Apr 27, 2019 · The one liner doesn't work because, in Python, assignment (fruit = isBig(y)) is a statement, not an expression. In C, C++, Perl, and countless other languages it is an expression, and …
Assign variable in while loop condition in Python?
162 Starting Python 3.8, and the introduction of assignment expressions (PEP 572) (:= operator), it's now possible to capture the condition value (data.readline()) of the while loop as a variable (line) in …
Python Multiple Assignment Statements In One Line
Aug 22, 2015 · But the python language reference states that assignment statements have the form ... and on assignment the expression_list is evaluated first and then the assigning happens. So how …
Why does Python assignment not return a value? - Stack Overflow
Why is Python assignment a statement rather than an expression? If it was an expression which returns the value of the right hand side in the assignment, it would have allowed for much less verbose code …
coding style - Assignment with "or" in python - Stack Overflow
Jan 6, 2012 · Is it considered bad style to assign values to variables like this? x = "foobar" or None y = some_variable or None In the above example, x gets the value 'foobar'.
Assign within if statement Python - Stack Overflow
May 6, 2015 · 8 For Python 3.8+, PEP 572 introduces Assignment Expressions This allows assigning to variables within an expression using the notation NAME := expr. It can be used within if statements, …
What is the difference between an expression and a statement in …
Jan 19, 2011 · In C, any expression is a legal statement. You can have func(x=2); Is that an Expression or Statement? (Answer: Expression used as a Statement with a side-effect.) The assignment …