python

[Solved] Overflow error in Python program

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The Runge-Kutta methods need to advance in small steps, 5 is not a small step. Try setting N to 1000.0 instead (the decimal is to make sure that (b-a)/N != 0). solved Overflow error in Python program

[Solved] Compare two lists value-wise in Python [closed]

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Suppose we have 2 list x = [‘3’, ‘1’] y = [‘1’, ‘3’] Solution-1: You can simply check whether the multisets with the elements of x and y are equal: import collections collections.Counter(x) == collections.Counter(y) This requires the elements to be hashable; runtime will be in O(n), where n is the size of the lists. … Read more

[Solved] Using zip_longest on unequal lists but repeat the last entry instead of returning None

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itertools.izip_longest takes an optional fillvalue argument that provides the value that is used after the shorter list has been exhausted. fillvalue defaults to None, giving the behaviour you show in your question, but you can specify a different value to get the behaviour you want: fill = a[-1] if (len(a) < len(b)) else b[-1] for … Read more

[Solved] .upper not working in python

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The .upper() and .lower() functions do not modify the original str. Per the documentation, For .upper(): str.upper() Return a copy of the string with all the cased characters converted to uppercase. For .lower(): str.lower() Return a copy of the string with all the cased characters converted to lowercase. So if you want the uppercase and … Read more

[Solved] Python Code Creation [closed]

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First, try using a dict() to store the mappings. Lots easier. mymappings = dict() def add_mapping( l1, l2): mymappings[l1] = l2 mymappings[l2] = l1 add_mapping(‘a’,’e’) add_mapping(‘b’,’z’) … word = None while word != ”: word = raw_input(“Word:”) print ”.join( [mymappings[x] for x in word if mymappings.has_key(x)] ) Then just do a list comprehension on your … Read more

[Solved] Try except in Python, error still happens

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Like stated in the comments: put the relevant code in the try clause, and raise a specific exception. You can prompt again with a loop. Something like this: succeeded = False while not succeeded: try: aws_account = input(“Enter the name of the AWS account you’ll be working in: “) session = boto3.Session(profile_name=aws_account) client = session.client(‘iam’) … Read more

[Solved] Parse XML to Table in Python

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I’ve got the needed outcome using following script. XML File: <?xml version=”1.0″ encoding=”UTF-8″?> <base> <element1>element 1</element1> <element2>element 2</element2> <element3> <subElement3>subElement 3</subElement3> </element3> </base> Python code: import pandas as pd from lxml import etree data = “C:/Path/test.xml” tree = etree.parse(data) lstKey = [] lstValue = [] for p in tree.iter() : lstKey.append(tree.getpath(p).replace(“https://stackoverflow.com/”,”.”)[1:]) lstValue.append(p.text) df = pd.DataFrame({‘key’ … Read more

[Solved] Recieve global variable (Cython)

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In an Ipython session I can do: In [2]: %load_ext Cython In [3]: one = 1 In [4]: %%cython …: def foo(num): …: return num + 1 …: In [5]: foo(one) Out[5]: 2 That is I define a cython function, but call it from Python with the global variable. If I define the function with … Read more

[Solved] Python – IndexError: list index out of range

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This is not a valid python code, u are missing braces. Here : data = { u’entities’: { u’symbols’: [], u’user_mentions’: [], u’hashtags’: [{u’indices’: [3, 13], u’text’: u’firstpost’}, {u’indices’: [22, 35], u’text’: u’snowinginnyc’}], u’urls’: [{u’url’: u’https://t.co/0sClwIMXKW’, u’indices’: [36, 59], u’expanded_url’: u’https://vine.co/v/hQPlQ9l5XDD’, u’display_url’: u’vine.co/v/hQPlQ9l5XDD’} ] } } and print data[‘entities’][‘urls’][0][‘expanded_url’] prints vine.co/v/hQPlQ9l5XDD solved Python – IndexError: … Read more