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What to modify in the program such that ... - sbabu - Feb-29-2020
What to change such that it only displays the information when executed directly, but it must not not display anything if it is imported as a module. The code works fine, but what to change ?
from math import pi
def circle_area(r):
return pi * (r ** 2)
def circle_circumference(r):
return 2 * pi * r
radius = float(input("Enter radius: "))
print("Area =", circle_area(radius))
print("Circumference =", circle_circumference(radius))Thanks.
RE: What to modify in the program such that ... - ndc85430 - Feb-29-2020
See this.
RE: What to modify in the program such that ... - sbabu - Feb-29-2020
Hi, ndc85430
Name of the script is ScriptEnv.py
from math import pi
def circle_area(r):
return pi * (r ** 2)
def circle_circumference(r):
return 2 * pi * r
radius = float(input("Enter radius: "))
print("Area =", circle_area(radius))
print("Circumference =", circle_circumference(radius))
def main():
print("Running the main function")
if __name__ == "__main__":
main()This works. Created another script with the name ScriptEnv2.py to call this main ScriptEnv.py
import ScriptEnv ScriptEnv.circle_area() ScriptEnv.circle_circumference()
Output:>>> %Debug ScriptEnv2.py
Enter radius: 2
Area = 12.566370614359172
Circumference = 12.566370614359172
Traceback (most recent call last):
File "E:\Python\Thony_Scripts\ScriptEnv2.py", line 3, in <module>
ScriptEnv.circle_area()
TypeError: circle_area() missing 1 required positional argument: 'r'Thanks.
RE: What to modify in the program such that ... - ndc85430 - Feb-29-2020
Your functions take arguments. Why aren't you passing anything when you call them?
RE: What to modify in the program such that ... - sbabu - Mar-01-2020
It's in the main script. ScriptEnv.py
#line no 9
radius = float(input("Enter radius: "))Thanks
RE: What to modify in the program such that ... - ndc85430 - Mar-01-2020
On lines 3 and 6 of ScriptEnv.py, the functions are defined to take a single parameter,
r. In ScriptEnv2.py, you're calling those functions on lines 3 and 4 without passing any arguments. Compare this with lines 10 and 11 in ScriptEnv.py - there you're passing radius to both functions. If a function takes arguments, you must supply them (assuming no defaults of course!). It's really as simple as that.
RE: What to modify in the program such that ... - jefsummers - Mar-01-2020
When you call the ScriptEnv.circle_area() function, you are only calling that particular function in the module, and the input line you have above does not get executed.
I suggest defining a class. Something like this (untested)
class geometry:
from math import pi
def __init__(self)
self.go = False
def circle_area(r):
if go:
return pi * (r ** 2)
def circle_circumference(r):
if go:
return 2 * pi * rWhich is then called byimport geometry
def main(g):
print("Running the main function")
radius = float(input("Enter radius: "))
print("Area =", g.circle_area(radius))
print("Circumference =", g.circle_circumference(radius))
if __name__ == "__main__":
g = geometry()
g.go = True
main(g)Dunder Main creates the geometry object and sets go to true, and passes the g object to main(). Function calls are then to the g object. If a geometry object is created elsewhere the default value for go is False, and nothing will print out. Malformed calls to the g object will still give error messages, as in the case of not passing a parameter.One oops from not testing - need self. in front of the go's in the functions within the class
RE: What to modify in the program such that ... - buran - Mar-01-2020
This is going really into strange direction.
@jefsummers - what is the purpose of g.go property? and the class - as it is it defy the purpose of class.
to answer original question - as suggested by @ndc85430, you can use
if __name__ == '__main__': blockfrom math import pi
def circle_area(r):
return pi * (r ** 2)
def circle_circumference(r):
return 2 * pi * r
if __name__ == "__main__":
radius = float(input("Enter radius: "))
print("Area =", circle_area(radius))
print("Circumference =", circle_circumference(radius))now, if it has to be class:from math import pi
class Circle():
def __init__(self, radius):
self.radius = radius
@property
def area(self):
return pi * (self.radius ** 2)
@property
def circumference(self):
return 2 * pi * self.radius
if __name__ == "__main__":
radius = float(input("Enter radius: "))
circle = Circle(radius) # create instance of Circle class
print("Area =", circle.area)
print("Circumference =", circle.circumference)in both cases nothing will happen if you import the module - functions and the class will be available to use in the other module, but the code in the if __name__ == '__main__': block will not be executed
RE: What to modify in the program such that ... - jefsummers - Mar-01-2020
Quote:@jefsummers - what is the purpose of g.go property? and the class - as it is it defy the purpose of class.From the OP
Quote:but it must not not display anything if it is imported as a module.So the go property is a flag, so that it does not display anything unless go is set to True. Someone importing as a module and accessing the functions directly will not get anything displayed. Running the file by itself will run properly.
@buran - in both of your solutions the functions can be called and will output even if the file is imported as a module.
Or maybe I misunderstood the question.
RE: What to modify in the program such that ... - buran - Mar-01-2020
yep, you misunderstood the question. In the OP original code if they import it in another module, then the 2 functions are accessible, but also lines 9-11 get executed at the time of the import. OP wants to prevent this from happening
(Feb-29-2020, 06:15 AM)sbabu Wrote: only displays the information when executed directly, but it must not not display anything if it is imported as a module