Python - What does setting the find() method to -1 mean?

Question

zzz = 'Saitama is a hero'

def f(a):
if a.find('hero') == -1: # What does == -1 mean here?
print('found')

f(zzz)

Does it mean finding the specified value's reverse?
Or does it mean "if there is the absence of the specified value" ?

How come "found" is printed when I delete 'hero' from zzz?

Answer 1

-1 means not found
write this to find output if the condtion didn't achive

zzz = 'Saitama is a hero'

def f(a):
if a.find('hero') == -1: # What does == -1 mean here?
print('found')
else:
print("gggg")

f(zzz)

Answer 2

U should write any sentence if the condition equal false to execute it and i u don't put else stament u will have output "no output" as the condition equal false
And u should use the ready function find like the next not like u do

zzz = 'Saitama is sleeping'

def f(a):
if a.find('hero')== True:
print('found')
else:
print ("Mhmd")

f(zzz)

Solus

Answer 3

No , what is the benifit or object from the single qutation

Answer 4

find() method returns the index of the given argument in the calling string object. If the calling string object contains the given argument, the index is returned, but otherwise -1 is returned (indices are positive numbers only - including 0).

"Wonder why this also prints 'found':"

zzz = 'Saitama is sleeping'

def f(a):
if a.find('hero'):
print('found')

f(zzz)

'hero' is not a substring of <zzz>, so -1 is returned. But also remember that Python considers a non zero value to be true, logically. So `if a.find('hero'):` is pretty much `if -1:` which evaluates to true.

Answer 5

Muhammad

So basically "if the specified value is NOT found"

Answer 6

Wonder why this also prints found:

zzz = 'Saitama is sleeping'

def f(a):
if a.find('hero'): <------- shouldn't this be false?
print('found')

f(zzz)

Answer 7

I see, so we need a ' == True ' between the find() method and the colon.