If I run a Python script from Powershell via the call operator ($val = & python myscript.py) – How can I pass in an array to $val from Python?

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英文:

If I run a Python script from Powershell via the call operator ($val = & python myscript.py) - How can I pass in an array to $val from Python?

问题

以下是已翻译的代码部分：

  1. import os
  2. import sys
  3. import pathlib
  4. import json
  5. from contextlib import redirect_stderr
  6. from fontTools import ttLib
  7. from fontmeta import FontMeta
  9. # 检查命令行参数
  10. if len(sys.argv) == 1:
  11.     print('未提供参数。')
  12.     exit(0)
  14. fontfile = sys.argv[1]
  17. def font_name(font_path, name_idx):
  18.     font = ttLib.TTFont(font_path, ignoreDecompileErrors=True)
  19.     with redirect_stderr(None):
  20.         names = font['name'].names
  22.     details = {}
  23.     for x in names:
  24.         if x.langID == 0 or x.langID == 1033:
  25.             try:
  26.                 details[x.nameID] = x.toUnicode()
  27.             except UnicodeDecodeError:
  28.                 details[x.nameID] = x.string.decode(errors='ignore')
  29.     # details[4] = 全名
  30.     # details[1] = 字体族名
  31.     # details[2] = 样式名
  32.     return details[name_idx]
  35. meta_instance = FontMeta(fontfile)
  37. metadata = meta_instance.get_full_data()
  39. fontFullName = font_name(fontfile, 4)
  40. fontFamily = font_name(fontfile, 1)
  41. fontStyle = font_name(fontfile, 2)
  42. fontVers = metadata[5]['value']
  43. fontVers = fontVers.replace('Version ', "v")
  44. fontLang = metadata[1]['language']['value']
  45. fontUniqueID = metadata[3]['value']
  46. fontPostscriptName = metadata[6]['value']
  47. fontPostscriptEncoding = metadata[6]['encoding']['value']
  48. fontDesigner = metadata[9]['value']
  49. fontLicenseURL = metadata[14]['value']
  51. print('全名:     ' + fontFullName)
  52. print('字体族:   ' + fontFamily)
  53. print('样式:     ' + fontStyle)
  54. print('版本:     ' + fontVers)
  55. print('语言:     ' + fontLang)
  56. print('唯一标识: ' + fontUniqueID)
  57. print('许可证网址: ' + fontLicenseURL)
  58. print('字体设计师: ' + fontDesigner)

希望这对你有所帮助。如果你需要更多帮助，请随时提问。

英文:

Here's a sample script:

  1. import os
  2. import sys
  3. import pathlib
  4. import json
  5. from contextlib import redirect_stderr
  6. from fontTools import ttLib
  7. from fontmeta import FontMeta
  8. # Check for commandline argument
  9. if len(sys.argv) == 1:
  10. print('No argument was supplied.')
  11. exit(0)
  12. fontfile = sys.argv[1]
  13. def font_name(font_path, name_idx):
  14. font = ttLib.TTFont(font_path, ignoreDecompileErrors=True)
  15. with redirect_stderr(None):
  16. names = font['name'].names
  17. details = {}
  18. for x in names:
  19. if x.langID == 0 or x.langID == 1033:
  20. try:
  21. details[x.nameID] = x.toUnicode()
  22. except UnicodeDecodeError:
  23. details[x.nameID] = x.string.decode(errors='ignore')
  24. # details[4] = Full Name
  25. # details[1] = Family Name
  26. # details[2] = Style Name
  27. return details[name_idx]
  28. meta_instance = FontMeta(fontfile)
  29. metadata = meta_instance.get_full_data()
  30. fontFullName           = font_name(fontfile,4)
  31. fontFamily             = font_name(fontfile,1)
  32. fontStyle              = font_name(fontfile,2)
  33. fontVers               = metadata[5]['value'];
  34. fontVers               = fontVers.replace('Version ',"v")
  35. fontLang               = metadata[1]['language']['value'];
  36. fontUniqueID           = metadata[3]['value']
  37. fontPostscriptName     = metadata[6]['value']
  38. fontPostscriptEncoding = metadata[6]['encoding']['value']
  39. fontDesigner           = metadata[9]['value']
  40. fontLicenseURL         = metadata[14]['value']
  41. print('Full Name:     ' + fontFullName)
  42. print('Family:        ' + fontFamily)
  43. print('Style:         ' + fontStyle)
  44. print('Version:       ' + fontVers)
  45. print('Language:      ' + fontLang)
  46. print('UniqueID:      ' + fontUniqueID)
  47. print('License URL:   ' + fontLicenseURL)
  48. print('Font Designer: ' + fontDesigner)

Output:

  1. Full Name:     Sharp Sans Bold
  2. Family:        Sharp Sans
  3. Style:         Bold
  4. Version:       v1.001
  5. Language:      English/United States
  6. UniqueID:      1.001;2016;SHRP;SharpSans-Bold
  7. License URL:   http://www.sharptype.co
  8. Font Designer: Lucas Sharp

ps1:

  1. & "D:\Dev\Python\00 VENV\FontTools\Scripts\Activate.ps1"
  2. $val = python "D:\Dev\Python\Font Scripts\GetFontInfo.py" "D:\Fonts\00 Test\SharpSans-Bold.otf"
  3. Write-Host "`$val:" $val -ForegroundColor Green

Right now the Python code is just printing values. My PS script is echoing the printed values as a string. Is there a way to pass these values to powershell other than just printing them - I.E. as an array?

Or should I return JSON and parse it in PowerShell?

Any help appreciated.

答案1

得分: 1

当PowerShell调用一个外部程序时，它会将stdout输出的每一行逐行传送到PowerShell的管道。

如果通过将流捕获到一个变量的赋值来操作这个流：

  • 两行或更多会成为一个数组（类型为[object[]]）来存储这些行。

  • 一行会原样存储，作为一个字符串（类型为[string]）。

因此：

  1. $val = python "D:\Dev\Python\Font Scripts\GetFontInfo.py" "D:\Fonts\00 Test\SharpSans-Bold.otf"

单独执行上述命令就足以将来自python调用的stdout输出行捕获为一个数组 - 假设有两行或更多。

如果您希望确保$val始终是一个数组 - 即使只有一个输出行，您有两个选择：

  1. $val = @(python "D:\Dev\Python\Font Scripts\GetFontInfo.py" "D:\Fonts\00 Test\SharpSans-Bold.otf")
  • 要么：使用一个**[array]类型约束**（等同于[object[]]）：
  1. [array] $val = python "D:\Dev\Python\Font Scripts\GetFontInfo.py" "D:\Fonts\00 Test\SharpSans-Bold.otf"

注意：

  • 上述两种方法之间存在细微差异 - 详见此答案以获取详细信息。

  • 当PowerShell捕获或重定向来自外部程序的输出时，通常涉及根据存储在[Console]::OutputEncoding中的字符编码进行.NET字符串的解码 - 请参见此答案。

  • 要验证$val确实是一个数组，请运行$val.GetType().FullName。

  • 要逐行打印每个数组元素，请不要使用Write-Host，只需将$val单独提交（这等同于使用Write-Output $val，尽管后者的显式使用很少需要 - 详见此答案以获取背景信息）。

英文:

When PowerShell invokes an external program, it streams the individual lines of its stdout output one by one to PowerShell's pipeline.

If you capture this stream via assignment to a variable:

  • two or more lines become an array (of type [object[]]) storing the lines.

  • one line is stored as-is, as a string (type [string]).

Therefore:

  1. $val = python "D:\Dev\Python\Font Scripts\GetFontInfo.py" "D:\Fonts\00 Test\SharpSans-Bold.otf"

by itself is sufficient to capture the stdout output lines from your python call as an array - assuming there are two or more lines.

If you want to ensure that $val is always an array - even if there's only one output line, you have two options:

  1. $val = @(python "D:\Dev\Python\Font Scripts\GetFontInfo.py" "D:\Fonts\00 Test\SharpSans-Bold.otf")
  • Or: Use an [array] type constraint (equivalent to [object[]]):
  1. [array] $val = python "D:\Dev\Python\Font Scripts\GetFontInfo.py" "D:\Fonts\00 Test\SharpSans-Bold.otf"

Note:

  • There are subtle differences between the two approaches above - see this answer for details.

  • When PowerShell captures or redirects output from external programs, decoding into .NET strings based on the character encoding stored in [Console]::OutputEncoding is invariably involved - see this answer.

  • To verify that $val is indeed an array, run $val.GetType().FullName.

  • To print each array element on it own line, do not use Write-Host, simply submit $val on its own (which is equivalent to using Write-Output $val, though the latter's explicit use is rarely needed - see this answer for background information.

答案2

得分: 0

你可以按行打印这些值，并按照这里的指示拆分输出：

  1. $arr = $val.Split([Environment]::NewLine)
英文:

You can print the values line by line and split the output by newline as instructed here:

  1. $arr = $val.Split([Environment]::NewLine)

huangapple
  • 本文由 发表于 2023年8月4日 04:57:47
  • 转载请务必保留本文链接：https://go.coder-hub.com/76831562.html
  • powershell
  • python
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