euler.start_problem() - Code Metrics - nekedome/project-euler - Measure and Improve Code Quality continuously with Scrutinizer

euler.start_problem() F
last analyzed 2018-07-11 15:35 UTC

↳ Parent: euler

Complexity

Conditions

Size

Total Lines	60
Code Lines	39

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
cc	14
eloc	39
nop	1
dl	0
loc	60
rs	3.6
c	0
b	0
f	0

How to fix Long Method Complexity

"""
:mod:`euler` -- Command Line Interface
======================================

.. module:: euler
   :synopsis: Project's command line interface (CLI).

.. moduleauthor:: Bill Maroney <[email protected]>
"""

import argparse
import importlib
import os
import pytest
import urllib.request
from bs4 import BeautifulSoup
from time import time
from typing import Dict

from lib.util import wrap
from tests.validation_test import SOLUTION_MODULE_ROOT, SOLUTION_MODULE_PATH

TEMPLATE_PATH = "problem_template"  # template used to start new problem
RST_TEMPLATE_PATH = "rst_template"  # template used to document new problem
BASE_URL = "https://projecteuler.net/"  # URL of Project Euler web-site


def start_problem(selection):
    """ Create a template solution Python file for a selected Project Euler problem

    The Python file will be populated by the problem description and boilerplate needed by this project.
    """

    template = _load_templates()  # load templates for Python and rst files

    # Ask user for the problem number (if it wasn't specified on command line)
    if selection is None:
        selection = input("Select a problem: ")

    # Parse the specified problem number
    err_msg = "Error: you must enter a positive decimal number."
    try:
        problem_number = int(selection)
    except ValueError:
        print(err_msg)
        return
    if problem_number <= 0:
        print(err_msg)
        return

    # Fetch the problem URL
    url = "{}problem={}".format(BASE_URL, problem_number)
    with urllib.request.urlopen(url) as fp:
        soup = BeautifulSoup(fp, "html.parser")

        # Extract the problem title, capitalise it
        title = soup.find("h2").text
        title = " ".join([word if word.isupper() else word.title() for word in title.split(" ")])

        # Extract the problem statement
        problem = soup.find("div", attrs={"class": "problem_content"})
        paragraphs = problem.text.split("\n")
        problem_statement = ""
        for paragraph in [paragraph for paragraph in paragraphs if paragraph != ""]:
            problem_statement += wrap(paragraph, 0, 120)
            problem_statement += "\n\n"
        problem_statement = problem_statement.rstrip("\n")

        problem_statement = problem_statement.encode("ascii", "ignore").decode()

        # Write the problem templates (if they don't already exist)
        path = _build_template_paths(problem_number)
        if not os.path.exists(path["py"]):
            with open(path["py"], "w") as op:
                uline = "=" * len("Project Euler Problem {id}: {title}".format(id=problem_number, title=title))
                op.write(template["py"].format(id=problem_number, title=title, underline=uline, problem=problem_statement))
        else:
            print("Error: {} already exists.".format(path["py"]))
            return
        if not os.path.exists(path["rst"]):
            with open(path["rst"], "w") as op:
                op.write(template["rst"].format(id=problem_number))
        else:
            print("Error: {} already exists.".format(path["rst"]))
            return

        _fetch_downloads(problem)


def solve_problem(selection):
    """ Dynamically load and run solution for a selected Project Euler problem """

    # Ask user for the problem number (if it wasn't specified on command line)
    if selection is None:
        selection = input("Select a problem: ")

    # Parse the specified problem number
    err_msg = "Error: you must enter a positive decimal number."
    try:
        problem_number = int(selection)
    except ValueError:
        print(err_msg)
        return
    if problem_number <= 0:
        print(err_msg)
        return

    if isinstance(problem_number, int):
        # Attempt to dynamically load the solution module
        try:
            mod = importlib.import_module(SOLUTION_MODULE_PATH.format(problem_number))
        except ModuleNotFoundError:

            print("Error: solution for problem {} doesn't currently exist.".format(problem_number))
            return  # cannot proceed without the problem module

        # Attempt to compute the solution and check its correctness
        try:
            t0 = time()
            answer = mod.solve()
            t1 = time()
        except AttributeError as err:
            print("Error: {}.".format(err))
            return  # cannot proceed with problem modules solve function

        # Attempt to retrieve the expected answer
        try:
            expected_answer = mod.expected_answer
        except AttributeError as err:
            expected_answer = None
            print("Warning: {}.".format(err))

        # Report the results and runtime
        if expected_answer is None:
            suffix = "cannot be checked."
        elif expected_answer == answer:
            suffix = "is correct."
        else:
            suffix = "is incorrect.\nExpected solution is {}.".format(expected_answer)
        print("Solution is {}, which {}".format(answer, suffix))
        print("Solution took {:.2f} seconds to compute.".format(t1 - t0))


def _build_args_parser():
    parser = argparse.ArgumentParser()
    subparsers = parser.add_subparsers(dest="command")

    parser_start = subparsers.add_parser("start", help="Start a new Project Euler problem")
    parser_start.add_argument("n", nargs="?", type=int, help="problem number (default: prompt user for input)")

    parser_solve = subparsers.add_parser("solve", help="Compute the answer to a single Project Euler problem")
    parser_solve.add_argument("n", nargs="?", type=int, help="problem number (default: prompt user for input)")

    parser_validate = subparsers.add_parser("validate", help="Compute answers to all Project Euler problems")

    return parser


def _load_templates() -> Dict[str, str]:
    # Load the problem template to be instantiated with this new problem
    with open(os.path.join(os.path.dirname(__file__), TEMPLATE_PATH), "r") as fp:
        py_template = fp.read()

    # Load the reStructuredText template to be instantiated with this new problem
    with open(os.path.join(os.path.dirname(__file__), RST_TEMPLATE_PATH), "r") as fp:
        rst_template = fp.read()

    return {"py": py_template, "rst": rst_template}


def _build_template_paths(problem_number: int) -> Dict[str, str]:
    base_path = os.path.dirname(__file__)
    py_path = os.path.join(base_path, "solutions", "problem{}.py".format(problem_number))
    rst_path = os.path.join(base_path, "docs", "solutions", "{}.rst".format(problem_number))
    return {"py": py_path, "rst": rst_path}


def _fetch_downloads(problem: str) -> None:
    # Search for possible file attachments and prompt for optional downloads
    files = problem.find_all("a")
    for file in files:
        file_url = "{}{}".format(BASE_URL, file["href"])
        filename = file["href"].split("/")[-1]
        file_path = os.path.join("data", "problems", filename)

        if os.path.exists(file_path):
            print("Warning: {} already exists.".format(file_path))
            continue

        choice = input("Download '{}'? [y/N]: ".format(filename))
        if choice == 'y':
            with urllib.request.urlopen(file_url) as ffp:
                data = ffp.read()
                open(file_path, "w").write(data.decode("utf8"))


def main():
    """ Main program entry point """

    # Build an argument parser and apply it to the command-line arguments
    parser = _build_args_parser()
    args = parser.parse_args()

    # Perform the requested action
    if args.command == "start":
        # Start a problem
        start_problem(args.n)
    elif args.command == "solve":
        # Execute a single solution displaying answer (for submission to Project Euler)
        solve_problem(args.n)
    elif args.command == "validate":
        # Validate all existing solutions
        pytest.main(["tests/validation_test.py"])  # run the pytest unit-testing framework
    else:
        parser.print_usage()  # invalid command


if __name__ == "__main__":
    main()


1			"""
2			:mod:`euler` -- Command Line Interface
3			======================================
4
5			.. module:: euler
6			:synopsis: Project's command line interface (CLI).
7
8			.. moduleauthor:: Bill Maroney <[email protected]>
9			"""
10
11			import argparse
12			import importlib
13			import os
14			import pytest
15			import urllib.request
16			from bs4 import BeautifulSoup
17			from time import time
18			from typing import Dict
19
20			from lib.util import wrap
21			from tests.validation_test import SOLUTION_MODULE_ROOT, SOLUTION_MODULE_PATH
22
23			TEMPLATE_PATH = "problem_template" # template used to start new problem
24			RST_TEMPLATE_PATH = "rst_template" # template used to document new problem
25			BASE_URL = "https://projecteuler.net/" # URL of Project Euler web-site
26
27
28			def start_problem(selection):
29			""" Create a template solution Python file for a selected Project Euler problem
30
31			The Python file will be populated by the problem description and boilerplate needed by this project.
32			"""
33
34			template = _load_templates() # load templates for Python and rst files
35
36			# Ask user for the problem number (if it wasn't specified on command line)
37			if selection is None:
38			selection = input("Select a problem: ")
39
40			# Parse the specified problem number
41			err_msg = "Error: you must enter a positive decimal number."
42			try:
43			problem_number = int(selection)
44			except ValueError:
45			print(err_msg)
46			return
47			if problem_number <= 0:
48			print(err_msg)
49			return
50
51			# Fetch the problem URL
52			url = "{}problem={}".format(BASE_URL, problem_number)
53			with urllib.request.urlopen(url) as fp:
54			soup = BeautifulSoup(fp, "html.parser")
55
56			# Extract the problem title, capitalise it
57			title = soup.find("h2").text
58			title = " ".join([word if word.isupper() else word.title() for word in title.split(" ")])
59
60			# Extract the problem statement
61			problem = soup.find("div", attrs={"class": "problem_content"})
62			paragraphs = problem.text.split("\n")
63			problem_statement = ""
64			for paragraph in [paragraph for paragraph in paragraphs if paragraph != ""]:
65			problem_statement += wrap(paragraph, 0, 120)
66			problem_statement += "\n\n"
67			problem_statement = problem_statement.rstrip("\n")
68
69			problem_statement = problem_statement.encode("ascii", "ignore").decode()
70
71			# Write the problem templates (if they don't already exist)
72			path = _build_template_paths(problem_number)
73			if not os.path.exists(path["py"]):
74			with open(path["py"], "w") as op:
75			uline = "=" * len("Project Euler Problem {id}: {title}".format(id=problem_number, title=title))
76			op.write(template["py"].format(id=problem_number, title=title, underline=uline, problem=problem_statement))
77			else:
78			print("Error: {} already exists.".format(path["py"]))
79			return
80			if not os.path.exists(path["rst"]):
81			with open(path["rst"], "w") as op:
82			op.write(template["rst"].format(id=problem_number))
83			else:
84			print("Error: {} already exists.".format(path["rst"]))
85			return
86
87			_fetch_downloads(problem)
88
89
90			def solve_problem(selection):
91			""" Dynamically load and run solution for a selected Project Euler problem """
92
93			# Ask user for the problem number (if it wasn't specified on command line)
94			if selection is None:
95			selection = input("Select a problem: ")
96
97			# Parse the specified problem number
98			err_msg = "Error: you must enter a positive decimal number."
99			try:
100			problem_number = int(selection)
101			except ValueError:
102			print(err_msg)
103			return
104			if problem_number <= 0:
105			print(err_msg)
106			return
107
108			if isinstance(problem_number, int):
109			# Attempt to dynamically load the solution module
110			try:
111			mod = importlib.import_module(SOLUTION_MODULE_PATH.format(problem_number))
112			except ModuleNotFoundError:
			0 ignored issues – show Comprehensibility Best Practice introduced 2018-05-28 04:15 UTC by Report Bug Copy Issue Report The variable `ModuleNotFoundError` does not seem to be defined. Loading history...
113			print("Error: solution for problem {} doesn't currently exist.".format(problem_number))
114			return # cannot proceed without the problem module
115
116			# Attempt to compute the solution and check its correctness
117			try:
118			t0 = time()
119			answer = mod.solve()
120			t1 = time()
121			except AttributeError as err:
122			print("Error: {}.".format(err))
123			return # cannot proceed with problem modules solve function
124
125			# Attempt to retrieve the expected answer
126			try:
127			expected_answer = mod.expected_answer
128			except AttributeError as err:
129			expected_answer = None
130			print("Warning: {}.".format(err))
131
132			# Report the results and runtime
133			if expected_answer is None:
134			suffix = "cannot be checked."
135			elif expected_answer == answer:
136			suffix = "is correct."
137			else:
138			suffix = "is incorrect.\nExpected solution is {}.".format(expected_answer)
139			print("Solution is {}, which {}".format(answer, suffix))
140			print("Solution took {:.2f} seconds to compute.".format(t1 - t0))
141
142
143			def _build_args_parser():
144			parser = argparse.ArgumentParser()
145			subparsers = parser.add_subparsers(dest="command")
146
147			parser_start = subparsers.add_parser("start", help="Start a new Project Euler problem")
148			parser_start.add_argument("n", nargs="?", type=int, help="problem number (default: prompt user for input)")
149
150			parser_solve = subparsers.add_parser("solve", help="Compute the answer to a single Project Euler problem")
151			parser_solve.add_argument("n", nargs="?", type=int, help="problem number (default: prompt user for input)")
152
153			parser_validate = subparsers.add_parser("validate", help="Compute answers to all Project Euler problems")
154
155			return parser
156
157
158			def _load_templates() -> Dict[str, str]:
159			# Load the problem template to be instantiated with this new problem
160			with open(os.path.join(os.path.dirname(__file__), TEMPLATE_PATH), "r") as fp:
161			py_template = fp.read()
162
163			# Load the reStructuredText template to be instantiated with this new problem
164			with open(os.path.join(os.path.dirname(__file__), RST_TEMPLATE_PATH), "r") as fp:
165			rst_template = fp.read()
166
167			return {"py": py_template, "rst": rst_template}
168
169
170			def _build_template_paths(problem_number: int) -> Dict[str, str]:
171			base_path = os.path.dirname(__file__)
172			py_path = os.path.join(base_path, "solutions", "problem{}.py".format(problem_number))
173			rst_path = os.path.join(base_path, "docs", "solutions", "{}.rst".format(problem_number))
174			return {"py": py_path, "rst": rst_path}
175
176
177			def _fetch_downloads(problem: str) -> None:
178			# Search for possible file attachments and prompt for optional downloads
179			files = problem.find_all("a")
180			for file in files:
181			file_url = "{}{}".format(BASE_URL, file["href"])
182			filename = file["href"].split("/")[-1]
183			file_path = os.path.join("data", "problems", filename)
184
185			if os.path.exists(file_path):
186			print("Warning: {} already exists.".format(file_path))
187			continue
188
189			choice = input("Download '{}'? [y/N]: ".format(filename))
190			if choice == 'y':
191			with urllib.request.urlopen(file_url) as ffp:
192			data = ffp.read()
193			open(file_path, "w").write(data.decode("utf8"))
194
195
196			def main():
197			""" Main program entry point """
198
199			# Build an argument parser and apply it to the command-line arguments
200			parser = _build_args_parser()
201			args = parser.parse_args()
202
203			# Perform the requested action
204			if args.command == "start":
205			# Start a problem
206			start_problem(args.n)
207			elif args.command == "solve":
208			# Execute a single solution displaying answer (for submission to Project Euler)
209			solve_problem(args.n)
210			elif args.command == "validate":
211			# Validate all existing solutions
212			pytest.main(["tests/validation_test.py"]) # run the pytest unit-testing framework
213			else:
214			parser.print_usage() # invalid command
215
216
217			if __name__ == "__main__":
218			main()
219

nekedome / project-euler

euler.start_problem() F last analyzed 2018-07-11 15:35 UTC

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euler.start_problem() F
last analyzed 2018-07-11 15:35 UTC