创建一个旅行计划，尝试调试我的代码

Question

这是我的代码，我已经知道我的目的地和货币代码是正确的。但是我不确定这段代码，因为每次我尝试运行它时，它都不起作用。我不断被告知语法错误，但我需要再看一眼看看这里出了什么问题，因为我自己不太明白。我已经经历了它，我正在尝试解决我认为错误的事情。请帮忙。

# Trip Planner
# ------------
# The following program helps to create a travel itinerary

# Import modules
import destinations.py
import currency.py

def main():
    # Print a welcome message
    print_welcome()
    # Show destinations
    destinations.print_options()
    # Pick destination
    choice = destinations.get_choice()
    # Get destination info
    destination = destinations.get_info(choice)

    # Calculate currency exchange
    dollar_rate = currency.convert_dollars_to_euros(euro_rate)
    # Determine length of stay
    while True:
        try:
            length_of_stay = int(input("And how many days will you be staying in," destination " ?" ))
            # Check for non-positive input
            if (length_of_stay < 0):
                print("Please enter a positive number of days.")
                continue
            except ValueError:
                print("The value you entered is invalid. Only numerical values are valid.")
            else:
                break
    # Calculate cost
    cost = dollar_rate + length_of_stay

    # Save itinerary
    try:
        save_itinerary(destination, length_of_stay, cost)
    # Catch file errors
    except:
        print("Error: the itinerary could not be saved.")
    # Print confirmation
    else:
        print("Your trip to", destination "has been booked!")

# Call main
main()

def print_welcome():
    # Print a welcome message
    print("---------------------------")
    print("Welcome to the Trip Planner")
    print("---------------------------")

def save_itinerary(destination, length_of_stay, cost):
    # Itinerary File Name
    file_name = "itinerary.txt"
    # Create a new file
    itinerary_file = open(file_name, "r")
    # Write trip information
    file_name.write("Trip Itinerary")
    file_name.write("--------------")
    file_name.write("Destination: " + destination)
    file_name.write("Length of stay: " + length_of_stay)
    file_name.write("Cost: $" + format(cost, ",.2f"))
    # Close the file
    file_name.close()

这是目标代码：

# Destinations Module
# -------------------
# This module provides information about European destinations and rates
# All rates are in euros
def print_options():
    # Print travel options
    print("Travel Options")
    print("--------------")
    print("1. Rome")
    print("2. Berlin")
    print("3. Vienna")
    print("")

def get_choice():
    # Get destination choice
    while True:
        try:
            choice = int(input("Where would you like to go? "))
            if (choice < 1) or (choice > 3):
                print("Please select a choice between 1 and 3.")
                continue
        except ValueError:
            print("The value you entered is invalid. Only numerical values are valid.")
        else:
            return choice

def get_info(choice):
    # Use numeric choice to look up destination info
    # Rates are listed in euros per day
    # Choice 1: Rome at €45/day
    if (choice == 1):
        return "Rome", 45
    # Choice 2: Berlin at €18/day
    elif (choice == 2):
        return "Berlin", 18
    # Choice 3: Vienna, €34/day
    elif (choice == 3):
        return "Vienna", 34

这是货币代码：

# Currency Module
# ---------------
# This module is used to convert between different types of currency.

convert_dollars_to_euros(dollar_rate):
    return dollar_rate / 1.12

convert_euros_to_dollars(euro_rate):
    return euro_rate * 1.12

Answer 1

从您的评论中，您指出您从该行中得到语法错误

convert_dollars_to_euros(dollar_rate):
    return dollar_rate / 1.12

以下使这成为法律功能声明：

def convert_dollars_to_euros(dollar_rate):
    return dollar_rate / 1.12

您缺少关键字"def"，这是

创建函数时必需的关键字，自从您在其他代码中定义了函数"main"以来，您似乎已经知道这一点。

另外，虽然它会编译，

import destinations.py

也不正确，因为它将在空间"目的地"中查找名为"py"的对象

import destinations

工作得很好。它的编写方式，你会得到一个运行时异常，类似于 ImportError