Use raw_input in Python 2 to get a string, input in Python 2 is equivalent to eval(raw_input). >>> type(raw_input()) 23 <type ‘str’> >>> type(input()) 12 <type ‘int’> So, When you enter something like n in input it thinks that you’re looking for a variable named n: >>> input() n Traceback (most recent call last): File … Read more
Default argument values are evaluated at function define-time, but self is an argument only available at function call time. Thus arguments in the argument list cannot refer each other. It’s a common pattern to default an argument to None and add a test for that in code: def p(self, b=None): if b is None: b … Read more
This error comes when you append this line os.path.join(os.path.dirname(__file__)) in python interactive shell. Python Shell doesn’t detect current file path in __file__ and it’s related to your filepath in which you added this line So you should write this line os.path.join(os.path.dirname(__file__)) in file.py. and then run python file.py, It works because it takes your filepath.
You can’t call a function unless you’ve already defined it. Move the def createDirs(): block up to the top of your file, below the imports. Some languages allow you to use functions before defining them. For example, javascript calls this “hoisting”. But Python is not one of those languages. Note that it’s allowable to refer … Read more
Python doesn’t scope code to the local class automatically; you need to tell it to. pp = self.foobar(arg1, arg2) http://docs.python.org/tutorial/classes.html
Since test() doesn’t know who is abc, that msg NameError: global name ‘abc’ is not defined you see should happen when you invoke b.test() (calling b.abc() is fine), change it to: class a: def abc(self): print “haha” def test(self): self.abc() # abc() b = a() b.abc() # ‘haha’ is printed b.test() # ‘haha’ is printed
Python 3 renamed the unicode type to str, the old str type has been replaced by bytes. if isinstance(unicode_or_str, str): text = unicode_or_str decoded = False else: text = unicode_or_str.decode(encoding) decoded = True You may want to read the Python 3 porting HOWTO for more such details. There is also Lennart Regebro’s Porting to Python … Read more
In Ruby, local variables are defined by the parser when it first encounters an assignment, and are then in scope from that point on. Here’s a little demonstration: foo # NameError: undefined local variable or method `foo’ for main:Object if false foo = 42 end foo # => nil As you can see, the local … Read more
Define the class before you use it: class Something: def out(self): print(“it works”) s = Something() s.out() You need to pass self as the first argument to all instance methods.
TL;DR input function in Python 2.7, evaluates whatever your enter, as a Python expression. If you simply want to read strings, then use raw_input function in Python 2.7, which will not evaluate the read strings. If you are using Python 3.x, raw_input has been renamed to input. Quoting the Python 3.0 release notes, raw_input() was … Read more