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<p>我正在开发一个简单的转换器,并将所有转换因子存储在目录中。它接受要从中转换的内容和要转换的内容,检查以确保它是可转换的,并获取需要转换的内容,然后出错并返回此错误:</p>
<pre><code>Traceback (most recent call last):
File "python", line 20, in <module>
TypeError: string indices must be integers
</code></pre>
<p>代码(活着的代码完成后不会永远循环):</p>
<pre><code>alive = 'yes'
while(alive == 'yes'):
doable = {'pint': ['cup', 'quart', 'galleon', 'pint'], 'quart': ['cup', 'quart', 'pint', 'galleon'], 'galleon': ['cup', 'quart', 'pint', 'galleon'], 'cup': ['cup', 'quart', 'galleon', 'pint', 'tbsp', 'tsp'], 'ounce': ['cup', 'tbsp', 'tsp', 'ounce', 'ml', 'liter', 'pound', 'gram', 'kilogram'], 'tbsp': ['cup', 'tbsp', 'tsp', 'ounce'], 'tsp': ['tsp', 'tbsp', 'cup', 'ounce'], 'ml': ['ml', 'ounce', 'liter'], 'liter': ['ml', 'ounce', 'liter'], 'pound': ['ounce', 'gram', 'kilogram', 'pound'], 'gram': ['ounce', 'gram', 'kilogram', 'pound'], 'kilogram': ['ounce', 'gram', 'kilogram', 'pound']}
pint = {'cup': 2, 'quart': 0.5, 'galleon': 0.125, 'pint': 1}
quart = {'cup': 4, 'quart': 1, 'galleon': 0.25, 'pint': 2}
galleon = {'cup': 16, 'quart': 4, 'galleon': 1, 'pint': 8}
cup = {'cup': 1, 'quart': 0.25, 'galleon': 0.0625, 'pint': 0.5, 'tbsp': 16, 'tsp': 48, 'ounce': 8}
ounce = {'cup': 0.125, 'tbsp': 2, 'tsp': 6, 'ounce': 1, 'ml': 30, 'liter': 0.0295735, 'pound': 0.0625, 'gram': 28.3495, 'kilogram': 0.0283495}
tbsp = {'cup': 0.0616115, 'tbsp': 1, 'tsp': 3, 'ounce': 0.5}
tsp = {'cup': 0.020833333, 'tbsp': 0.33333, 'tsp': 1, 'ounce': 0.166667}
ml = {'ml': 1, 'ounce': 0.033814, 'liter': 0.001}
liter = {'ml': 1000, 'ounce':33.8, 'liter': 1}
pound = {'ounce': 16, 'gram': 453.592, 'kilogram': 0.453592, 'pound': 1}
gram = {'ounce': 0.035274, 'gram': 1, 'kilogram': 0.001, 'pound': 0.00220462}
kilogram = {'ounce': 35.274, 'gram': 1000, 'kilogram': 1, 'pound': 2.2}
first = input("What would you like to convert from? ")
second = input("What would you like to convert to? ")
if(second in doable[first]):
amount = input("What is the amount of the first measurement? ")
conversion = first[second]
answer = float(amount) * float(conversion)
print("Your answer is: " + str(answer) + " " + second + "(s).")
else:
print("\nYOU CAN NOT CONVERT BETWEEN THESE TWO VARIABLES.")
alive = 'no'
</code></pre>
<p>你知道为什么会出错,如何修复或者其他方法来避免错误吗?谢谢。你知道吗</p>