In my python program I am getting this error: KeyError: 'variablename' From this code: path = meta_entry['path'].strip('/'), Can anyone please explain why this is happening?

Jan 15, 2019 · Exceptions in Python are not very expensive. Plus, if you consider that most of the time the key you are looking for (the count) is there, then it is totally fine. d = {} while True: try: d['count'] += 1 except KeyError: d['count'] = 1 # happens only once

This still won't handle bare-string exceptions (or exceptions of unrelated types that you've somehow managed to raise behind the interpreter's back—pretty easy to do accidentally in a C extension module, not so easy to do even on purpose in …

Sep 1, 2019 · New to python and what looks like simple doable piece of code yielding KeyError: patt=list('jkasb') dict ...

Sep 3, 2017 · If you want to do the explicit check if the key is in the dictionary you have to check if the key is in the dictionary (without indexing!). For example: if item in functionTable: # checks if "item" is a *key* in the dict "functionTable" functionField = functionTable[item] # store the *value* for the *key* "item" else: functionField = "00"

May 18, 2017 · I am trying to read data from a csv file into a pandas dataframe, and access the first column 'Date' import pandas as pd df_ticks=pd.read_csv('values.csv', delimiter=',') print(df_ticks.columns)

Mar 27, 2013 · In Python 3 I have a program coded as below. It basically takes an input from a user and checks it against a dictionary (EXCHANGE_DATA) and outputs a list of information. from shares import

Mar 30, 2017 · Since you would have to branch on the key that failed anyway, it's probably clearer to put each lookup in a separate try statement. – chepner Commented Apr 17, 2014 at 17:18

Use sep=r'\s*,\s*' to parse a file where the columns may have some number of spaces preceding or following the delimiter (e.g. , ):

Nov 26, 2021 · Hi I'm still pretty new in python and would like to know why this line: RP[p][t] = demand[p][t] / fillingrate[p] is leading to the error: KeyError: 0. it follows the relevant part of the code. Is it just a mistake of notation or what's the best way to solve it?