I’m attempting to solve Project Euler 21 but I’m getting KeyError: 0 which normally occurs when you refer to a dictionary key that doesn’t exist. However, I thought I had solved that problem with the < 10000 condition. The error refers to the first ‘if’ statement in the main() function. Any ideas?
How come I’m getting this error? My code: Error:
My question looks like this: I am supposed to solve the equation. My answer seems to come out as 8 when using PEMDAS: But when putting it into python, I get a 2. Why is this so? It seems the programs order is as such: I don’t get it.
The following code answered my question:
It seems from your error than the ‘index’ variable is a string, not an int. You could convert it using int(). Now, string[index:] will also be an string. So you would need to convert that too: That’s assuming that string[index:] only contains a number. If that’s not always the case, you can do something like: … Read more
Change to You are getting the input from the console as a string, so you must cast that input string to an int object in order to do numerical operations.
As you are in python3 , use dict.items() instead of dict.iteritems() iteritems() was removed in python3, so you can’t use this method anymore. Take a look at Python 3.0 Wiki Built-in Changes section, where it is stated: Removed dict.iteritems(), dict.iterkeys(), and dict.itervalues(). Instead: use dict.items(), dict.keys(), and dict.values() respectively.
I have the following directory: mymodule.py: main.py: But when I run it, then I get this error: This works: But I get no auto completion when I type this in and there is a message: “unresolved reference: mymodule” and “unresolved reference: myclass”. And in my other project, which I am working on, I get the … Read more
The right answer (using Python 2.7 and later, since check_output() was introduced then) is: To demonstrate, here are my two programs: py2.py: py3.py: Running it: Here’s what’s wrong with each of your versions: First, str(‘python py2.py’) is exactly the same thing as ‘python py2.py’—you’re taking a str, and calling str to convert it to an str. This makes the code harder to read, longer, … Read more
It seems to me as though the installation has messed up somehow. Try running: This should reinstall everything from PyPi. This should solve the problem as I think running pip install “ipython[notebook]” messed things up.