使用元组作为密钥在Python

Question

我很新的编程所以请原谅我如果有什么是没有意义的，或者如果我的字的东西不正确。我有一个关于使用元组的字典键的问题。

首先，我有用户输入的号码，

num = input("Enter a number here: ") 

然后，我把这个数字值转换成元组：

numTup = tuple(num) 

接下来，创建连接数字键字的字典值：

numWords = {'1': "One", '2': "Two", '3': "Three", '4': "Four", '5': "Five", '6': "Six", '7': "Seven", '8': "Eight", '9': "Nine"} 

最后，我希望它打印对应的字典值t o元组中的键。我敢肯定，这就是我得到它错了。

print(numWords[numTup]) 

基本上我想要这个程序做的是有它打印每个用户输入的数字作为一个词，即。 456将变成“四五六”。

完整（不正确）的脚本：

num = input("Enter a number here: ") 
numTup = tuple(num) 
numWords = {'1': "One", '2': "Two", '3': "Three", '4': "Four", '5': "Five", '6': "Six", '7': "Seven", '8': "Eight", '9': "Nine"} 
print(numWords[numTup]) 

Answer 1

的tuple没有必要在这种情况下，因为你的字典会将键分配给关联的字符串。

num = input("Enter a number here: ") 

numWords = {'1': "One", '2': "Two", '3': "Three", '4': "Four", '5': "Five", '6': "Six", '7': "Seven", '8': "Eight", '9': "Nine"} 
for n in num: 
    print(numWords[n], end=' ') 

演示：

Enter a number here: 456 
Four Five Six 

Answer 2

你为什么要转成数元组目前尚不清楚，但如果你想要的，你在一个错误的方式做。当你想创建一个int元组，你应该做到以下几点：

numTup = (num) 

而且完整的代码应该是这样的：

num = input("Enter a number here: ") 
numTup = (num) 
numWords = {'1': "One", '2': "Two", '3': "Three", '4': "Four", '5': "Five", '6': "Six", '7': "Seven", '8': "Eight", '9': "Nine"} 
print(numWords[numTup]) 

Answer 3

还有就是你的字典的键type和将其转换为一个元组tuple(num)之后的输入之间的不匹配。 您既可以直接跳过部分，你转换成元组：

num = input("Enter number here: ") 
num = input("Enter a number here: ") 
numWords = {'1': "One", '2': "Two", '3': "Three", '4': "Four", '5': "Five", '6': "Six", '7': "Seven", '8': "Eight", '9': "Nine"} 
print(numWords[num]) 

OR

索引，元组和采摘第0个元素访问元素：

num = input("Enter number here: ") 
num = input("Enter a number here: ") 
numTup = tuple(num) 
numWords = {'1': "One", '2': "Two", '3': "Three", '4': "Four", '5': "Five", '6': "Six", '7': "Seven", '8': "Eight", '9': "Nine"} 
print(numWords[numTup[0]]) 

注意：确保用于访问字典项目的键和变量的数据类型相同。您可以使用type()命令检查变量的数据类型。

Answer 4

''' 
You can print the number in words given irs numeric 
version if by defining your dictionary with 
the following format: 
    dict{'number': 'word'} 

Then, calling the dictionary as follows: 
    dict['number'] 
''' 

# Number (keys) and words (values) dictionary 
numWords = {'1': "One", '2': "Two", 
'3': "Three", '4': "Four", 
'5': "Five", '6': "Six", 
'7': "Seven", '8': "Eight", 
'9': "Nine", '10': "Ten"} 

# Function that prints the number in words 
def print_values(): 
    for k,v in numWords.items(): 
     print(v) 

''' 
Alternatively, if you want to print a value using 
its key as an argument, you can use the following 
funciton: 
''' 

# Interactive function to print number in words 
# given the number 
def print_values2(): 
    key = input("What number would you like to print? ") 
    print(numWords[key]) 

''' 
P.s. if you want to add a number to your dictionary 
you can use the following function 
''' 

# Function to modify numWords 
def add_number(): 

    # Specify the number you want to add 
    numeric = input("Type in the number: ") 

    # Input the number in words 
    word = input("Write the number in words: ") 

    # Assign number and word to dictionary 
    numWords[numeric] = word 

    # Return modified dictionary 
    return numWords