Just started learning python and arrived at function definition. I have questions about the following code:
def abc():
b = random.randrange(3)
return b
I want to return a random number without input; however, it just showed neither error nor anything else.
return is not a function: it is a language operation or program statement.
Since you didn't tell it to print, it does not do anything visible—computers usually do exactly what you tell them to do.
To see the returned value, add code to display it. Add this after the function (below the return indented the same as def:
print ('random value is %d' % (abc()))
abc() is the function call
The % operator formats strings; the string on the left is the format control string and the arguments to the right are a list of values. Since the list has only one argument, the parenthesis around it are not needed, but don't hurt. An example of printing two values is:
print ('item %d is "%s"' % (j, s))
First work first, we make the function ,and you know how to so !
def abc():
b = random.randrange(3)
return b
Secondly we need to know that return returns the output in the location where we called the function.
for example:
def example():
return "learning"
print (example()) #"learning" is sent to this line because example() is called here!
I hope you are clear about return now! Finally for your seeing output - you can print the output inside the function ,which would be a bad practice!
def abc():
b = random.randrange(3)
print (b)
return b
Also print the output from where it was called (like I said before)!
random_number = abc() # if you want to store the returned result somewhere
print(random_number)
or (works same)
print(abc()) # directly print the result; no storing the result
When the function abc()returns something let's say int value 6. you can understand as whenever you call this function abc(), it gives value 6. Your code is only a function definition, and if you want to see the value, you must call the function first and print to the console by either
print(abc())
Or store the return value to a variable then print
var = abc()
print(var)
printitprint(b)in your function, orprint(abc())in your script.