python

[Solved] Using Python regex matches in eval()

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You don’t need eval. In fact, you want to avoid eval like the plague. You can achieve the same output with match.expand: mystr=”abc123def456ghi” user_input1 = r'(\d+).+?(\d+)’ user_input2 = r’\2\1′ match = re.search(user_input1, mystr) result = match.expand(user_input2) # result: 456123 The example about inserting 999 between the matches is easily solved by using the \g<group_number> syntax: … Read more

[Solved] How do you train a neural network without an exact answer? [closed]

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TLDR; Reinforcement learning In general, training agents uses reinforcement learning. It is different than what you explained, because it seems as if you want to define a fitness heuristic to tell the agent whether it is doing OK or not, which might be biased. Reinforcement learning also has biases, but they are researchedand studied. A … Read more

[Solved] Try to plot finance data with datetime but met error TypeError: string indices must be integers, not str

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The following could be used to plot your data. The main point is that you need to specify the (rather unusual) format of the datetimes (“%Y/%m/%d/%H/%M”), such that it can be converted to a datetime object. import pandas as pd import matplotlib.pyplot as plt df = pd.read_csv(“data/minuteData.csv”) df[“minute”] = pd.to_datetime(df[“minute”], format=”%Y/%m/%d/%H/%M”) plt.plot(df[“minute”],df[“spreadprice”], label=”spreadprice” ) plt.plot(df[“minute”],df[“bollup”], … Read more

[Solved] Sorting a list based on associated scores [closed]

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I would approach this as follows: from collections import defaultdict # using defaultdict makes the sums easier correlations = defaultdict(int) # default to int (i.e. 0) for i1, i2, correl in strScoresDict: # loop through data correlations[i1] += correl # add score for first item correlations[i2] += correl # and second item output = sorted(correlations, … Read more

[Solved] Capitalization of the first letters of words in a sentence using python code [closed]

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.split(sep): Specifically split method takes a string and returns a list of the words in the string, using sep as the delimiter string. If no separator value is passed, it takes whitespace as the separator. For example: a = “This is an example” a.split() # gives [‘This’, ‘is’, ‘an’, ‘example’] -> same as a.split(‘ ‘) … Read more

[Solved] Creating text files in a python script

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If your professor is running on Linux, Unix or Mac they you can just run the python file by a) ensuring it starts with a comment reading: #!/usr/bin/env python and then setting the file as executable with chmod +x scriptname.py If he/she is running on windows either he/she will have to install python, (then they … Read more

[Solved] How do you make this shape in Python with nested loops?

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for row in range(6): # this outer loop computes each of the 6 lines line_to_print=”#” for num_spaces in range(row): # this inner loop adds the desired number or spaces to the line line_to_print = line_to_print + ‘ ‘ line_to_print = line_to_print + ‘#’ print line_to_print prints this output: ## # # # # # # … Read more

[Solved] How to check pep8 standards in my code [closed]

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The term for this is “linting”. A python module called Pylint is available. It checks for coding standards and errors with full customizability. It can be run from the command line, as part of a continuous integration workflow, integrated into various IDEs. 6 solved How to check pep8 standards in my code [closed]

[Solved] Define a function count_down() that consumes a number a produces a string counting down to 1 [closed]

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Not a code-writing service nor a tutorial. But for its simplicity’s sake, a possible solution could look like def count_down(n): return ‘, ‘.join(str(i) for i in range(n, 0, -1)) # return ‘, ‘.join(map(str, range(n, 0, -1))) >>> count_down(5) ‘5, 4, 3, 2, 1’ join, str, range are very fundamental functions/methods you should read up on … Read more

[Solved] Can´t join a list the way I would like

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str converts the list into its string representation. Use map to convert each number in the list to str: lista = [1,2,3,4,9,5] print(“<“.join(map(str, sorted(lista)))) >>> 1<2<3<4<5<9 0 solved Can´t join a list the way I would like