IndexError:列表索引超出范围-python [英] IndexError: list index out of range - python

问题描述

我遇到以下错误:

currency = row[0]
IndexError: list index out of range

这是代码:

 crntAmnt = int(input("Please enter the amount of money to convert: "))
    print(currencies)
    exRtFile = open ('exchangeRate.csv','r')
    exchReader = csv.reader(exRtFile)
    crntCurrency = input("Please enter the current currency: ")
    validateloop=0
    while validateloop == 0:
        for row in exchReader:
                currency = row[0]
                if currency == crntCurrency:
                    crntRt = row[1]
                    validateloop=+1

在这里CSV文件:

日元169.948

美元，1.67

英镑，1

欧元，5.5

这是一个输入/输出示例:

Here's an input/Output example:

Please enter the amount of money to convert: 100
['Pound Sterling', 'Euro', 'US Dollar', 'Japanese Yen']
Please enter the current currency: Pound Sterling

推荐答案

您的csv文件中可能存在空白行，从而导致其生成一个空列表

You probably have a blank row in your csv file, causing it to produce an empty list

有几种解决方案

1.检查是否有元素，只有在存在时才继续:

1. Check if there are elements, only proceed if there are:

for row in exchReader:
    if len(row):  # can also just do   if row:
        currency = row[0]
        if currency == crntCurrency:

---

2.短路and运算符以使currency为空列表，该列表与crntCurrency不匹配:

---

2. Short-circuit an and operator to make currency an empty list, which won't match crntCurrency:

for row in exchReader:
    currency = row and row[0]
    if currency == crntCurrency:

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