[英]Passing dictionary to a function
我試圖在函數中使用字典值,並且不斷收到NameError
。 不知道我在做什么錯。
import re
def main():
sales_amount = get_amount()
customer_ID = get_ID()
discounts = read_discounts()
calculate_discount(sales_amount, discounts)
print(discount_percentage)
#print (discounts)
def get_amount():
return float(input("Enter total sales amount: "))
def get_ID():
return float(input("Enter customer ID: "))
#function to read discount values, strip non-alphanumeric characters and add values to dictionary
def read_discounts():
myFile = open('discount.txt', 'r')
discountValues = {}
#read and split first line
firstLine = myFile.readline()
firstLine = re.sub(r'\$','',firstLine)
firstLine = re.sub(r'\%','',firstLine)
firstLine = firstLine.split()
#add values to dictionary
discountValues['UpperLimit1'] = {firstLine[2]}
discountValues['UpperLimit1'] = [ float(x) for x in discountValues['UpperLimit1'] ]
discountValues['PercentDiscount1'] = {firstLine[4]}
discountValues['PercentDiscount1'] = [ float(x) for x in discountValues['PercentDiscount1'] ]
return (discountValues)
def calculate_discount(sales_amount,discounts):
if sales_amount < discountValues[UpperLimit1]:
discount_percentage = discountValues[PercentDiscount1]
main()
這是回溯:
Traceback (most recent call last):
File "C:\Users\Sam\Desktop\test.py", line 92, in <module>
main()
File "C:\Users\Sam\Desktop\test.py", line 7, in main
calculate_discount(sales_amount, discountValues)
NameError: global name 'discountValues' is not defined
我試過將字典名稱作為函數中的參數傳遞,但結果相同。 另外我還應該注意,我知道將文本文件讀入字典的方法可能不是最佳方法,但我現在想重點關注calculate_discount
函數。
完全公開:這是一項作業。
discounts = read_discounts()
calculate_discount(sales_amount, discountValues)
您節省了discounts
。 使用它代替discountValues
。
再次在這里:
def calculate_discount(sales_amount,discounts):
if sales_amount < discountValues[UpperLimit1]:
discount_percentage = discountValues[PercentDiscount1]
一致使用名稱。
您的read_discounts()
方法似乎也有不正確的縮進。
在您的主要功能中,您正在一行中使用變量“ discountValues”:
calculate_discount(sales_amount, discountValues)
它尚未被聲明,如果您打算使用gloabl,請在main()函數內使用此語句。
def main():
global discountValues
...
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