I'd like to use self (for global variables) and the parameters from the command-line in my Python Script but can't really get them to work.
def otherFunction(self)
print self.tecE
def main(argv,self):
self.tecE = 'test'
otherFunction()
if __name__ == "__main__":
main(sys.argv[1:],self)
This gives me an error:
main(sys.argv[1:],self)
NameError: name 'self' is not defined
So how and where to define self?
Usually the python convention of self is to be used in python classes, you did a bit of a mess.
So either you are not using classes and treating self just as a global dict, like this:
import sys
myglobal = {} # Didn't want to name it self, for avoiding confusing you :)
def otherFunction():
print myglobal["tecE"]
def main(argv):
myglobal["tecE"] = 'test'
otherFunction()
if __name__ == "__main__":
main(sys.argv[1:])
Or writing a class, like this:
import sys
class MyClass():
def otherFunction(self):
print self.tecE
def main(self, argv):
self.tecE = 'test'
self.otherFunction() # Calling other class members (using the self object which actually acting like the "this" keyword in other languages like in Java and similars)
if __name__ == "__main__":
myObj = MyClass() # Instantiating an object out of your class
myObj.main(sys.argv[1:])
So how and where to define self?
You will use self:
def my_method(self, arg1, arg2):self.do_job("something", 123)self.new_field = 56 Usually in __init__() constructor methodNote: decalring a class variable without the self.new_var, will create a static class variable.
self outside of a class. They already think it means something it doesn't (although it's not clear what). Use a different name.
selfin main?selfis normally only used in combination with classes ... I assume you copy pasted this code (mainly the different functions) from somewhere else (where the class-keyword has been used) - without understanding it.thisis used. Wouldn't mind to make a class out of it, but is there some kind of template for the usage of global variables and parameters for a simple script to be run in the command line?thisorself, they are just variable names. No matter if within or outside of a class. You have to define them just like any other variable. It's just a convention to useselfwithin a class to reference the current class instance.this?thisis Java, not Python. The python class syntax is a bit different then the java syntax stackoverflow.com/questions/64141/classes-in-python