# Python case explanation of calculation results based on input parameters

Time：2021-9-15

## 1、 Problem description

define function，calculate the input parameters and return the result.

• The data is stored in txt as a matrix of 10 rows and 10 columns.
• Write a function and pass in parameters: file path, first data row and column index, second data row and column index and operator.
• Return calculation results
• If no file path is passed in, a random integer array with a value of 10 * 10 ranging from [6, 66] is randomly generated and stored in txt for subsequent data reading and testing.

## 2、 Python program

Import the required dependent libraries and log output configurations

``````# -*- coding: UTF-8 -*-
"""
@Author: ye Tingyun
@ official account: practice Python
@CSDN    ：https://yetingyun.blog.csdn.net/
"""
import numpy as np
import logging

logging.basicConfig(level=logging.INFO, format='%(asctime)s - %(levelname)s: %(message)s')``````

Generate data

``````def generate_fake_data():
"""
: params: None
: Return: none
: function: if no file path is passed in, randomly generate a random integer array with 10 * 10 values ranging from [6, 66]
Save TXT for subsequent data reading and testing
"""
#Create a 10 * 10 random number array with a normal distribution with a mean of 8 and a standard deviation of 1
# data = np.random.normal(8, 1, (10, 10))
#Create a random integer array with 10 * 10 values ranging from [6, 66]
data = np.random.randint(6, 66, (10, 10))
print(data)
with open("./data/random_data.txt", "w") as f:
for i in data:
for j in i:
f.write(str(j) + '\t')
f.write("\n")``````

Load data and calculate and return results.

``````def load_data_and_calculate(point1, point2, operation,
file="./data/random_data.txt"):
"""
: param file: the file path is the default parameter: the parameter that can be passed or omitted when calling the function. If it is not passed, the default value test will be used
: param point1: row column index tuple type of the first data
: param point2: row column index tuple type of the second data
: param operation: operator
: Return: the result of the operation
"""
If file = = ". / data / random_data. TXT": # if it is still the default parameter, it means that there is no file path passed in
generate_fake_data()
else:
pass
Data = NP. Fromfile (file, Sep = '\ t', dtype = NP. Float32) # read the fromfile method of TXT data numpy
new_ Data = data.reshape ([10, 10]) # (100,) reshape is (10, 10) 10 rows and 10 columns
print(new_data)
#Two data in the two-dimensional array are obtained according to the index, and possible index out of bounds exceptions are captured
num1, num2 = None, None
try:
num1 = new_data[point1[0]][point1[1]]
num2 = new_data[point2[0]][point2[1]]
Print (F "the two numbers obtained according to the row and column index are: {num1} {num2}") # print view
except IndexError:
Logging.info (F "the row column index exceeds the dataset boundary, and the current dataset shape is: {new_data. Shape}")

#Perform operations to catch possible exceptions
try:
#The eval function returns the result of the expression passed in a string
result = eval(f"{num1}{operation}{num2}")
print(f"result： {num1} {operation.strip()} {num2} = {result}\n")
return result
except ZeroDivisionError:
Logging. Error (F "divisor num2 cannot be zero!")
except SyntaxError:
if operator in ['x', 'X']:
else:
Logging. Error (F "illegal operator entered: ({operation})")``````

Pass in parameters and call the function.

``````file_path = "./data/testData.txt"
#Enter the first data row column index
X1, Y1 = map (int, input ("please enter the row and column coordinates of the first data (e.g. 6,8):"). Split ('))
#Enter the second data row column index
X2, y2 = map (int, input ("please enter the row and column coordinates of the first data (e.g. 3,5):"). Split ('))
#Input operation symbol
Operator = input ("please enter operators (such as +, -, *, // /,%...):")

#Pass in arguments
my_result = load_data_and_calculate((x1, y1), (x2, y2), operator, file_path)
#Output with two decimal places reserved
Print ("after {} operation, the result is: {:. 2F}". Format (operator, my_result))``````

The results are as follows:

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