Difference between multiple if's and elif's?

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In python, is there a difference between say:

if text == 'sometext':
    print(text)
if text == 'nottext':
    print("notanytext")

and

 if text == 'sometext':
        print(text)
 elif text == 'nottext':
        print("notanytext")

Just wondering if multiple ifs could cause any unwanted problems and if it would be better practice to use elifs.

Multiple if's means your code would go and check all the if conditions, where as in case of elif, if one if condition satisfies it would not check other conditions..

7/9 what is the difference between using 'if' and 'else if', 7/9 what is the difference between using 'if' and 'else if' ? has to go through each and every condition and thus multiple IF-conditions require more time. These multiple IF functions are called nested IF functions and they may prove particularly useful if you want your formula to return 3 or more different results. Here's a typical example: suppose you want not simply to qualify the students' results as Pass/Fail, but define the total score as " Good ", " Satisfactory " and " Poor ".

Is it better to use multiple if conditions or one if condition with , Is it better to use multiple if conditions or one if condition with multiple clauses What is the difference between the "if" and “if else” condition in C language? Download this free template for an IF statement between two numbers in Excel. In this tutorial, we show you step-by-step how to calculate IF with AND statement. Learn how to build an IF statement that will test if a cell contains a value between two numbers and then output the result you want if that condition is met

def multipleif(text):
    if text == 'sometext':
        print(text)
    if text == 'nottext':
        print("notanytext")

def eliftest(text):
    if text == 'sometext':
        print(text)
    elif text == 'nottext':
        print("notanytext")

text = "sometext"

timeit multipleif(text)
100000 loops, best of 3: 5.22 us per loop

timeit eliftest(text)
100000 loops, best of 3: 5.13 us per loop

You can see that elif is slightly faster. This would be more apparent if there were more ifs and more elifs.

Why should one use 'if-else-if' statements instead of just multiple 'if , Of course these structural differences depend on the language you are using. Java may function different from Perl, PHP different from Javascript. For instance​  IL code is a little bit different and here is the main difference: Approach One: L_0004: bne.un.s L_0011 -> L_0011: ldloc.0 with L_0010: ret Approach Two: L_0004: bne.un.s L_0010 -> L_0010: ldloc.0 with no ret in between When you use else statement, as in first approach, only the first branch that meets the condition will be run.

Here's another way of thinking about this:

Let's say you have two specific conditions that an if/else catchall structure will not suffice:

Example:

I have a 3 X 3 tic-tac-toe board and I want to print the coordinates of both diagonals and not the rest of the squares.

I decide to use and if/elif structure instead...

for row in range(3):
    for col in range(3):
        if row == col:
            print('diagonal1', '(%s, %s)' % (i, j))
        elif col == 2 - row:
            print('\t' * 6 + 'diagonal2', '(%s, %s)' % (i, j))

The output is:

diagonal1 (0, 0)
                        diagonal2 (0, 2)
diagonal1 (1, 1)
                        diagonal2 (2, 0)
diagonal1 (2, 2)

But wait! I wanted to include all three coordinates of diagonal2 since (1, 1) is part of diagonal 2 as well.

The 'elif' caused a dependency with the 'if' so that if the original 'if' was satisfied the 'elif' will not initiate even if the 'elif' logic satisfied the condition as well.

Let's change the second 'elif' to an 'if' instead.

for row in range(3):
    for col in range(3):
        if row == col:
            print('diagonal1', '(%s, %s)' % (i, j))
        if col == 2 - row:
            print('\t' * 6 + 'diagonal2', '(%s, %s)' % (i, j))

I now get the output that I wanted because the two 'if' statements are mutually exclusive.

diagonal1 (0, 0)
                        diagonal2 (0, 2)
diagonal1 (1, 1)
                        diagonal2 (1, 1)
                        diagonal2 (2, 0)
diagonal1 (2, 2)

Ultimately knowing what kind or result you want to achieve will determine what type of conditional relationship/structure you code.

Chapter 4: The if/else (if) statement and Nested statements, The else part of the if/else statement follows the same rules as the if part. If you want to execute multiple statements for the else condition, enclose the code in  The difference is that if the first if is true, all of the other else if s won't be executed, even if they do evaluate to true. If they were individual if s, however, all of the if s will be executed if they evaluate to true.

In your above example there are differences, because your second code has indented the elif, it would be actually inside the if block, and is a syntactically and logically incorrect in this example.

Python uses line indentions to define code blocks (most C like languages use {} to enclose a block of code, but python uses line indentions), so when you are coding, you should consider the indentions seriously.

your sample 1:

if text == 'sometext':
    print(text)
elif text == 'nottext':
    print("notanytext")

both if and elif are indented the same, so they are related to the same logic. your second example:

if text == 'sometext':
    print(text)
    elif text == 'nottext':
        print("notanytext")

elif is indented more than if, before another block encloses it, so it is considered inside the if block. and since inside the if there is no other nested if, the elif is being considered as a syntax error by Python interpreter.

What is the difference between using 'if' repeatedly and using 'elif' in , Multiple 'if' statements get checked one after another with no regard to the former's results. 'Elif' acts as 'else if', so is checked only in the 'else'  A single IF function only analyze two criteria. If there are more than two criteria, then it should use the multiple IF statements (nested IF). The number of IF functions required in multiple IF statements is the number of criteria minus 1. For those who do not understand yet a single IF function, please read the following article

C Programming Tutorial 58 - Multiple-If Vs Else-If, In the last video, we discussed how to use the Else-If Statement! Today we are talking about the Duration: 6:25 Posted: Dec 19, 2018 Key Differences Between if-else and switch. The expression inside if statement decides whether to execute the statements inside if block or under else block. On the other hand, the expression inside a switch statement decides which case to execute. You can have multiple if statement for multiple choice of statements.

MS Excel: How to use the Nested IF Functions (WS), if vs else if java nested if-else flowchart java if statement multiple conditions difference between if if and if else if multiple if vs else if c programming if statement  Compare two columns for matches or differences in the same row To compare two columns in Excel row-by-row, write a usual IF formula that compares the first two cells. Enter the formula in some other column in the same row, and then copy it down to other cells by dragging the fill handle (a small square in the bottom-right corner of the selected

Is there a limit to the number of elif statements allowed?, Do consider the case of multiple nested if-else and mixing case-statements with if​-else construct inside a process. Also when to use which construct ? PS: I have  In this tutorial, you will learn a variety of methods to compare Excel files and identify differences between them. See how to open two Excel windows side by side, how to use Excel formulas to create a difference report, highlight differences with conditional formatting, and more.