[英]How do you create variables based on user input? (Python)
我想創建一個程序來自動化我的科學評估。 這是代碼:
from statistics import mean
import matplotlib.pyplot as plt
import numpy as np
independent = input("What is your independent variable?\nindependent(unit): ")
dependent = input("What is your dependent variable?\ndependent(unit): ")
intervals = [int(x) for x in input(f"\nWhich {independent} values are you measuring? \nPlease seperate your answers with commas.: ").split(', ')]
try:
intervals[0]
except IndexError:
raise IndexError(f"PLease enter at least 5 {independent} values") from None
results1 = [int(x) for x in input(f"What are the results of {intervals[0]}: ").split(', ')]
try:
intervals[1]
except IndexError:
raise IndexError(f"PLease enter at least 5 {independent} values") from None
results2 = [int(x) for x in input(f"What are the results of {intervals[1]}: ").split(', ')]
try:
intervals[2]
except IndexError:
raise IndexError(f"PLease enter at least 5 {independent} values") from None
results3 = [int(x) for x in input(f"What are the results of {intervals[2]}: ").split(', ')]
try:
intervals[3]
except IndexError:
raise IndexError(f"PLease enter at least 5 {independent} values") from None
results4 = [int(x) for x in input(f"What are the results of {intervals[3]}: ").split(', ')]
try:
intervals[4]
except IndexError:
raise IndexError(f"PLease enter at least 5 {independent} values") from None
results5 = [int(x) for x in input(f"What are the results of {intervals[4]}: ").split(', ')]
# processing data
def average(a):
return mean(a)
def range(list):
list.sort()
min = list[0]
max = list[-1]
return max - min
print(f"\nThe average of {intervals[0]} is {average(results1)}. The Range is {range(results1)}")
print(f"\nThe average of {intervals[1]} is {average(results2)}. The Range is {range(results2)}")
print(f"\nThe average of {intervals[2]} is {average(results3)}. The Range is {range(results3)}")
print(f"\nThe average of {intervals[3]} is {average(results4)}. The Range is {range(results4)}")
print(f"\nThe average of {intervals[4]} is {average(results5)}. The Range is {range(results5)}")
# graphing
y = np.array(intervals)
x = np.array([average(results1), average(results2), average(results3), average(results4), average(results5)])
xerrorbars = [range(results1) / 2, range(results2) / 2, range(results3) / 2, range(results4) / 2, range(results5) / 2]
def give_me_a_straight_line(x,y):
w, b = np.polyfit(x,y,deg=1)
line = w * x + b
return line
line = give_me_a_straight_line(x,y)
plt.plot(x,y,'o')
plt.plot(x,line,'r--')
plt.errorbar(x, y, xerr=xerrorbars, fmt="o", color="blue")
plt.ylabel(independent)
plt.xlabel(dependent)
plt.grid()
plt.show()
如您所見,我添加了錯誤消息,以防用戶在可變間隔中輸入少於或多於 5 個項目。 這使得程序只有在輸入 5 個項目時才可用。 這很糟糕,因為有時您可能只想使用 4 或 3 個間隔。 有沒有辦法根據列表間隔中的項目創建許多變量?
使用列表而不是普通變量。
minVals = 5
if len(intervals) < minVals:
raise IndexError(f"Please enter at least 5 {independent} values")
results = []
for interval in intervals:
results.append([int(x) for x in input(f"What are the results of {intervals[0]}: ").split(', ')])
print(f"\nThe average of {intervals[0]} is {average(results[0])}.")
雖然您可以創建變量變量名稱,但大多數情況下這是一個糟糕的主意,因為它會弄亂您的命名空間,使其成為調試/修改和其他討厭的東西的噩夢。
大多數情況下,列表和字典將使用 waaaay 更簡潔的代碼做同樣的事情。
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