Python 如何从列表中的列表中删除撇号

我试图从

.csv

文件中计算行平均值，并返回每行平均值的列表。目前，我可以

in_ = [['1,2'], ['1,1,1,1'], ['-1,0,1'], ['42,17']]

但我需要删除撇号，以平均每个列表！我尝试过使用

int（）

，但没有成功

我的期望输出

out = [[1, 2], [1, 1, 1, 1], [-1, 0, 1], [42, 17]]

我目前的代码是：

def line_averages(filename):
    """takes a file and returns the average values of each line in a
    .csv file"""
    f = open(filename, 'r')
    lines = f.readlines()
    #print(lines)
    f.close()
    words = []
    for line in lines:
        words.append(line.split())
    for i in words:
        words.replace("'", "")
    return words

---

您正在这里重新发明CSV读卡器滚轮。使用来为您处理拆分；然后，我们只需将字符串列转换为整数：

def line_averages(filename):
    """takes a file and returns the average values of each line in a
    .csv file"""
    with open(filename, 'r', newline='') as f:
        reader = csv.reader(f)
        for row in reader:
            yield [int(c) for c in row]

for row in line_averages(some_file_name):
    # do something with each row

def line_averages(filename):
    """takes a file and returns the average values of each line in a
    .csv file"""
    with open(filename, 'r') as f:
        return [[int(c) for c in line.split(',')] for line in f]

这将生成一个生成器，迭代将为您提供带有整数的行：

def line_averages(filename):
    """takes a file and returns the average values of each line in a
    .csv file"""
    with open(filename, 'r', newline='') as f:
        reader = csv.reader(f)
        for row in reader:
            yield [int(c) for c in row]

for row in line_averages(some_file_name):
    # do something with each row

def line_averages(filename):
    """takes a file and returns the average values of each line in a
    .csv file"""
    with open(filename, 'r') as f:
        return [[int(c) for c in line.split(',')] for line in f]

您还可以返回列表的列表：

def line_averages(filename):
    """takes a file and returns the average values of each line in a
    .csv file"""
    with open(filename, 'r', newline='') as f:
        reader = csv.reader(f)
        return [[int(c) for c in row] for row in reader]

您的尝试在空格上拆分，而不是在逗号上拆分。您必须在

，

上显式拆分，并将列转换为整数：

def line_averages(filename):
    """takes a file and returns the average values of each line in a
    .csv file"""
    with open(filename, 'r', newline='') as f:
        reader = csv.reader(f)
        for row in reader:
            yield [int(c) for c in row]

for row in line_averages(some_file_name):
    # do something with each row

def line_averages(filename):
    """takes a file and returns the average values of each line in a
    .csv file"""
    with open(filename, 'r') as f:
        return [[int(c) for c in line.split(',')] for line in f]

我在这里用来生成列表列表，将文件中的每一行转换为整数列表

我还将该文件用作；这确保无论托管块中发生什么情况，文件都已关闭；不需要手动关闭它

---

我还将该文件用作迭代器；每次迭代（如

for

循环）都会得到文件中的下一行。无需使用

file.readlines（）

预先读取所有行，因为整个列表元素是一个字符串。首先尝试在

，

上拆分它们，然后通过“删除撇号”强制转换为整数。您的意思是“将字符串转换为整数”吗？这可能更容易搜索。请显示用于从csv文件读取的代码，好吗？可能有一种方法可以自动完成这项工作，而无需繁琐的后期处理步骤。您的问题不是“如何删除撇号”，而是“如何从CSV文件中读取数字”。您的问题设法避免了投票失败和关闭，只是因为您添加了自己的解决方案尝试。这给了我更多的背景来帮助你。以后，请确保您的问题从这些信息开始。感谢您的回答，当使用它输出的确切代码时：@SebTerry:是的，您有一个迭代器。现在，您可以在

for

循环中使用它。