变量的值不会在嵌套循环中递增（用 Python 写入文件）

Question

我有一个代码可以解析多个文本文件并从每个文件中提取给定的部分并将它们写入另一个文本文件。我一遍又一遍地重复这个过程，提取文件的下一部分并将它们写入另一个文本文件。

我使用变量 cube_i 从一个文件移动到另一个文件，使用变量 layer 从文本文件的一部分移动到另一部分。但是，我创建的循环不会超过 cube_i=0 和 layer=0。关于如何继续增加这些变量的值有什么建议吗？

rgx_start = re.compile(r'Z down')  # Second line before the start of the layer code: "G0Z2 ; Z down"
rgx_end = re.compile(r'Layer #')  # Second line after the end of the layer code: "; Layer #<integer>"
if layer in range(0, (layers_total + 1)):
    final_code.write('; ------------------------------\n')
    label = ';          Layer #{}\n'.format(layer)
    final_code.write(label)
    final_code.write('; ------------------------------\n')
    with open(first_file,'r') as gcode:  # Opening the first file to write the powder drop
        for i, line in enumerate(gcode.readlines()):
            if i in range(powdrop_start, (powdrop_end + 1)):  # Writing the powder drop
                final_code.write(line)
    cube_i = 0 # Reseting the cube_i variable
    if cube_i in range(0, (parts_total + 1)):
        label_cube = ';   PART #{}\n'.format(cube_i)
        final_code.write(label_cube)
        # Opening each text file separately
        with open(f_path, 'r') as gcode:  # f_path contains cube_i
            lines = gcode.readlines()
        start_i = prev_start[cube_i]
        for i, line in enumerate(lines[start_i + 1:]):  # Searching for the beginning of given layer
            if rgx_start.search(line):
                layer_start = start_i + i + 3
                break
        for i, line in enumerate(lines[layer_start + 1:]):  # Searching for the end of given layer
            if rgx_end.search(line):
                layer_end = layer_start + i - 1
                break
        for i, line in enumerate(lines[layer_start:layer_end + 1]):
            final_code.write(line)
        prev_start.append(layer_start)
        prev_end.append(layer_end)
        cube_i = + 1
    if layer == 0: # Writing the zeroth layer footer
        with open(first_file, 'r') as gcode:
            for i, line in enumerate(gcode.readlines()):
                if i == zeroth_ftr:
                    final_code.write(line)
    layer =+ 1

Answer 1

代码中有几个 for 循环被错误地写成了 if 语句。截断的正确代码是：

rgx_start = re.compile(r'Z down')  # Second line before the start of the layer code: "G0Z2 ; Z down"
rgx_end = re.compile(r'Layer #')  # Second line after the end of the layer code: "; Layer #<integer>"
for layer in range(0, (layers_total + 1)):
    final_code.write('; ------------------------------\n')
    label = ';          Layer #{}\n'.format(layer)
    final_code.write(label)
    final_code.write('; ------------------------------\n')
    with open(first_file,'r') as gcode:  # Opening the first file to write the powder drop
        for i, line in enumerate(gcode.readlines()):
            if i in range(powdrop_start, (powdrop_end + 1)):  # Writing the powder drop
                final_code.write(line)
    cube_i = 0 # Reseting the cube_i variable
    for cube_i in range(0, (parts_total + 1)):
        label_cube = ';   PART #{}\n'.format(cube_i)
        final_code.write(label_cube)
        # Opening each text file separately
        with open(f_path, 'r') as gcode:  # f_path contains cube_i
            lines = gcode.readlines()
        start_i = prev_start[cube_i]
        for i, line in enumerate(lines[start_i + 1:]):  # Searching for the beginning of given layer
            if rgx_start.search(line):
                layer_start = start_i + i + 3
                break
        for i, line in enumerate(lines[layer_start + 1:]):  # Searching for the end of given layer
            if rgx_end.search(line):
                layer_end = layer_start + i - 1
                break
        for i, line in enumerate(lines[layer_start:layer_end + 1]):
            final_code.write(line)
        prev_start.append(layer_start)
        prev_end.append(layer_end)
        cube_i = + 1
    if layer == 0: # Writing the zeroth layer footer
        with open(first_file, 'r') as gcode:
            for i, line in enumerate(gcode.readlines()):
                if i == zeroth_ftr:
                    final_code.write(line)
    layer =+ 1

这应该适用于您的情况。

变量的值不会在嵌套循环中递增（用 Python 写入文件）

Variable's value doesn't increment within nested loops (File writing with Python)

python

python-3.x

for-loop

nested-loops

file-writing