Question

我想从文件中读取行并在元组列表中打印内容但我在转换过程中得到了两个逗号我找不到删除更多逗号的方法。

代码：

def arrivalsFile(file_name):
    """
    Reads part of an input file with the arrivals into a list of flights.
    Requires: file_name, for arrivals, is a text file with the structure indicated in the quizz
    Ensures: list of tuples, each corresponding to one flight

    >>> arrivalsFile("arrivals_14_16.txt")
    [('KLM75', 'Amsterdam', '14:35', '60', '50'), ('AF111', 'Paris', '14:20', '50', '64'),       ('LH333', 'Frankfurt', '14:10', '112', '203'), ('KLM71', 'Madrid', '14:55', '120', '100'), ('TAP103', 'Salvador', '15:20', '174', '210'), ('LH123', 'Berlin', '15:10', '115', '210')]
    """
    lista = []
    inFile = open(file_name, "r")
    for line in inFile:
        if "Arrivals:" in line:
            for line in inFile:
                lista.append(tuple(line.split()))
    inFile.close()

执行：

**********************************************************************
File "Z:\Documents\1415\airConveyorBeltsGroup11\readInput.py", line 9, in __main__.arrivalsFile
Failed example:
arrivalsFile("arrivals_14_16.txt")
Expected:
[('KLM75', 'Amsterdam', '14:35', '60', '50'), ('AF111', 'Paris', '14:20', '50', '64'), ('LH333',    'Frankfurt', '14:10', '112', '203'), ('KLM71', 'Madrid', '14:55', '120', '100'), ('TAP103', 'Salvador', '15:20', '174', '210'), ('LH123', 'Berlin', '15:10', '115', '210')]
Got:
[('KLM75,', 'Amsterdam,', '14:35,', '60,', '50'), ('AF111,', 'Paris,', '14:20,', '50,', '64'), ('LH333,', 'Frankfurt,', '14:10,', '112,', '203'), ('KLM71,', 'Madrid,', '14:55,', '120,', '100'), ('TAP103,', 'Salvador,', '15:20,', '174,', '210'), ('LH123,', 'Berlin,', '15:10,', '115,', '210')]
**********************************************************************
1 items had failures:
1 of   1 in __main__.arrivalsFile
***Test Failed*** 1 failures.

Answer 1

lista.append(tuple(line.split(",")))

按,而不是space拆分。

Answer 2

您需要在,分割。

>>> line = 'KLM75, Amsterdam, 14:35, 60, 50'
>>> print(tuple(line.split(',')))
('KLM75', ' Amsterdam', ' 14:35', ' 60', ' 50')

如果您需要摆脱前导和尾随空格，请使用以下内容。

>>> print(tuple(element.strip() for element in line.split(',')))
('KLM75', 'Amsterdam', '14:35', '60', '50')

根据您的评论，您不想使用列表理解。好吧，从技术上讲，我使用了生成器表达式，而不是列表理解，但我修改了代码以显示你想要的内容。

lista = []
inFile = open(file_name, "r")
for line in inFile:
    if "Arrivals:" in line:
        data = []
        for line in inFile:
            for element in line.split(','):
                data.append(element.strip())
            lista.append(tuple(data))
inFile.close()

对于每一行，我们创建一个名为data的新列表，将已剥离的元素附加到此列表，并在我们遍历该行中的所有元素后将此列表转换为元组。

从字符串转换为元组 - 双逗号

2 个答案: