退出后如何访问“while True: try/break”循环内生成的局部变量？

Question

我编写了一个模块，它获取目录中的所有 TIFF 图像，对每个图像文件中的所有帧进行平均，并将平均图像保存到由以下指定的自动生成的子目录中outputPath：

def average_tiff_frames(inputPath):

    '''

    This function opens all TIFF image files in a directory, averages over all frames within each TIFF file,

    and saves the averaged images to a subdirectory.

    

    Parameters

    ----------

    inputPath : string

        Absolute path to the raw TIFF files

    '''

    import datetime

    import os

    

    import numpy as np

    from PIL import Image

    

    

    # Read image file names, create output folder

    while True:

        try:

            inputPath = os.path.join(inputPath, '')    # Add trailing slash or backslash to the input path if missing

            filenames = [filename for filename in os.listdir(inputPath)

                            if filename.endswith(('.tif', '.TIF', '.tiff', '.TIFF'))

                            and not filename.endswith(('_avg.tif'))]

            outputPath = os.path.join(inputPath, datetime.datetime.now().strftime('%Y%m%dT%H%M%S'), '')

            os.mkdir(outputPath)

            break

        except FileNotFoundError:

            print('TIFF file not found - or - frames in TIFF file already averaged (file name ends with "_avg.tif")')

    # Open image files, average over all frames, save averaged image files

    for filename in filenames:

        img = Image.open(inputPath + filename)

        width, height = img.size

        NFrames = img.n_frames

        imgArray = np.zeros((height, width))    # Ordering of axes: img.size returns (width, height), np.zeros takes (rows, columns)

        for i in range(NFrames):

            img.seek(i)

            imgArray += np.array(img)

            i += 1

        imgArrayAverage = imgArray / NFrames

        imgAverage = Image.fromarray(imgArrayAverage)

        imgAverage.save(outputPath + filename.rsplit('.')[0] + '_avg' + '.tif')

        img.close()

    return outputPath

这里有什么问题吗？

我的第一个想法是，它outputPath是循环本地的while True: try，并且在 后被破坏break，所以我outputPath = ''在循环之前实例化了一个空字符串，但这没有帮助。

Answer 1

您并不是试图在循环之外访问变量，而是试图完全在方法之外访问它。该方法返回您要查找的值，因此将该值设置为变量：outputPath = average_tiff_frames(inputPath)print(outputPath)或者直接打印：print(average_tiff_frames(inputPath))