Uvjetni iskazi Pythona provode različite izračune ili operacije ovisno o tome je li određeni Booleov uvjet procijenjen kao istinit ili lažan. U Pythonu, IF naredbe se bave uvjetnim naredbama.
Naučit ćemo kako koristiti uvjetne naredbe u Pythonu u ovom vodiču.
Što je Python If iskaz?
Za donošenje odluka upotrijebite naredbu if u Pythonu. Ima tijelo instrukcija koje se izvršavaju samo kada je ispunjen uvjet naredbe if. Dodatna naredba else, koja uključuje neke upute za naredbu else, pokreće se ako je if uvjet netočan.
Pythonova naredba if-else koristi se kada želite zadovoljiti jednu naredbu dok je druga lažna.
Python sintaksa if naredbe:
if Statement else Statement
Kodirati
# Python program to execute if statement a, b = 6, 5 # Initializing the if condition if a > b: code = 'a is greater than b' print(code)
Izlaz:
a is greater than b
Kako koristiti else uvjet?
Uvjet 'drugačije' obično se koristi kada se jedna izjava prosuđuje na temelju druge. Ako je uvjet spomenut u if kodnom bloku pogrešan, tada će tumač izvršiti else kodni blok.
Kodirati
# Python program to execute if-else statement a, b = 6, 5 # Initializing the if-else condition if a <b: code="a is less than b" print(code) else: print('a is greater than b') < pre> <p> <strong>Output:</strong> </p> <pre> a is greater than b </pre> <h2>When the else Statement does not Work</h2> <p>There could be a lot of situations where your 'otherwise condition' doesn't produce the desired outcome. Due to a flaw in the program's logic, it will print the incorrect result. This typically occurs when there are more than two statements or conditions in a program.</p> <p>An illustration will make this notion easier for you to grasp.</p> <p>Since both variables, in this case, are identical (9, 9), the program's output that 'x is greater than y' is FALSE. This is because it evaluates the first condition, or the if expression in Python, then prints the next condition (the else statement) by default if the first condition fails. The following step will examine how to fix this mistake.</p> <p> <strong>Code</strong> </p> <pre> # Python program when else condition does not work a, b = 9, 9 # Initializing the if-else condition if a <b: code="a is less than b" else: print(code) < pre> <p> <strong>Output:</strong> </p> <pre> a is greater than b </pre> <h2>How to use the elif Condition?</h2> <p>We can employ the 'elif' clause to fix the issue caused by the 'else condition' made earlier. You can instruct the software to print the third condition or alternative when the first two conditions fail or are erroneous by using the 'elif' condition.</p> <p> <strong>Code</strong> </p> <pre> # Python program to show how to use elif condition a, b = 9, 9 # Initializing the if-else condition if a <b: code="a is less than b" elif a="=" b: else: print(code) < pre> <p> <strong>Output:</strong> </p> <pre> a is equal to b </pre> <h2>Python Nested if Statement</h2> <p>The following example demonstrates nested if Statement Python</p> <p> <strong>Code</strong> </p> <pre> # Python program to show the nested if-else conditions A = 100 B = 200 C = 300 # Initializing the if-else conditions if B > A: if B > C: print('B is the largest number') else: if A > B: if A > C: print('A is the largest number') elif C > A: if C > B: print('C is the largest number') else: print('All numbers are equal') if B % C == 0: if A % C == 0: print('C is a common factor of A and B') </pre> <p> <strong>Output:</strong> </p> <pre> C is the largest number </pre> <hr></b:></pre></b:></pre></b:> Kada else naredba ne radi
Moglo bi biti puno situacija u kojima vaše 'drugačije stanje' ne daje željeni ishod. Zbog greške u logici programa ispisat će netočan rezultat. To se obično događa kada postoji više od dvije izjave ili uvjeta u programu.
Ilustracija će vam olakšati razumijevanje ovog pojma.
Budući da su obje varijable, u ovom slučaju, identične (9, 9), izlaz programa da je 'x veći od y' je NETOČAN. To je zato što procjenjuje prvi uvjet ili izraz if u Pythonu, a zatim ispisuje sljedeći uvjet (izjava else) prema zadanim postavkama ako prvi uvjet ne uspije. Sljedeći korak će ispitati kako popraviti ovu grešku.
Kodirati
# Python program when else condition does not work a, b = 9, 9 # Initializing the if-else condition if a <b: code="a is less than b" else: print(code) < pre> <p> <strong>Output:</strong> </p> <pre> a is greater than b </pre> <h2>How to use the elif Condition?</h2> <p>We can employ the 'elif' clause to fix the issue caused by the 'else condition' made earlier. You can instruct the software to print the third condition or alternative when the first two conditions fail or are erroneous by using the 'elif' condition.</p> <p> <strong>Code</strong> </p> <pre> # Python program to show how to use elif condition a, b = 9, 9 # Initializing the if-else condition if a <b: code="a is less than b" elif a="=" b: else: print(code) < pre> <p> <strong>Output:</strong> </p> <pre> a is equal to b </pre> <h2>Python Nested if Statement</h2> <p>The following example demonstrates nested if Statement Python</p> <p> <strong>Code</strong> </p> <pre> # Python program to show the nested if-else conditions A = 100 B = 200 C = 300 # Initializing the if-else conditions if B > A: if B > C: print('B is the largest number') else: if A > B: if A > C: print('A is the largest number') elif C > A: if C > B: print('C is the largest number') else: print('All numbers are equal') if B % C == 0: if A % C == 0: print('C is a common factor of A and B') </pre> <p> <strong>Output:</strong> </p> <pre> C is the largest number </pre> <hr></b:></pre></b:>
Kako koristiti elif Condition?
Možemo upotrijebiti klauzulu 'elif' da riješimo problem uzrokovan 'else uvjetom' postavljenim ranije. Možete uputiti softver da ispiše treći uvjet ili alternativu kada prva dva uvjeta ne ispune ili su pogrešna korištenjem uvjeta 'elif'.
Kodirati
# Python program to show how to use elif condition a, b = 9, 9 # Initializing the if-else condition if a <b: code="a is less than b" elif a="=" b: else: print(code) < pre> <p> <strong>Output:</strong> </p> <pre> a is equal to b </pre> <h2>Python Nested if Statement</h2> <p>The following example demonstrates nested if Statement Python</p> <p> <strong>Code</strong> </p> <pre> # Python program to show the nested if-else conditions A = 100 B = 200 C = 300 # Initializing the if-else conditions if B > A: if B > C: print('B is the largest number') else: if A > B: if A > C: print('A is the largest number') elif C > A: if C > B: print('C is the largest number') else: print('All numbers are equal') if B % C == 0: if A % C == 0: print('C is a common factor of A and B') </pre> <p> <strong>Output:</strong> </p> <pre> C is the largest number </pre> <hr></b:>
Python ugniježđena if naredba
Sljedeći primjer demonstrira ugniježđenu if izjavu Python
Kodirati
# Python program to show the nested if-else conditions A = 100 B = 200 C = 300 # Initializing the if-else conditions if B > A: if B > C: print('B is the largest number') else: if A > B: if A > C: print('A is the largest number') elif C > A: if C > B: print('C is the largest number') else: print('All numbers are equal') if B % C == 0: if A % C == 0: print('C is a common factor of A and B')
Izlaz:
C is the largest number