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annotate third_party/emsdk/scripts/update_python.py @ 215:c3df85159b31

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removed a python library that isn't used for much.
author June Park <parkjune1995@gmail.com>
date Sat, 28 Feb 2026 20:34:18 -0800
parents 8d17f6e6e290
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
179
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1 #!/usr/bin/env python3
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2 # Copyright 2020 The Emscripten Authors. All rights reserved.
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3 # Emscripten is available under two separate licenses, the MIT license and the
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4 # University of Illinois/NCSA Open Source License. Both these licenses can be
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5 # found in the LICENSE file.
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6
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7 """Updates the python binaries that we cache store at
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8 http://storage.google.com/webassembly.
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9
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10 We only supply binaries for windows and macOS, but we do it very different ways for those two OSes.
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11 On Linux, we depend on the system version of python.
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12
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13 Windows recipe:
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14 1. Download precompiled version of python from NuGet package manager,
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15 either the package "python" for AMD64, or "pythonarm64" for ARM64.
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16 2. Set up pip and install pywin32 and psutil via pip for emrun to work.
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17 3. Re-zip and upload to storage.google.com
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19 macOS recipe:
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20 1. Clone cpython
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21 2. Use homebrew to install and configure openssl (for static linking!)
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22 3. Build cpython from source and use `make install` to create archive.
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23 """
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24
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25 import glob
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26 import multiprocessing
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27 import os
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28 import platform
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29 import shutil
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30 import sys
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31 import urllib.request
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32 from subprocess import check_call
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33
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34 from zip import unzip_cmd, zip_cmd
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35
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36 version = '3.13.3'
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37 major_minor_version = '.'.join(version.split('.')[:2]) # e.g. '3.9.2' -> '3.9'
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38 # This is not part of official Python version, but a repackaging number appended by emsdk
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39 # when a version of Python needs to be redownloaded.
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40 revision = '0'
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41
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42 PSUTIL = 'psutil==7.0.0'
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44 upload_base = 'gs://webassembly/emscripten-releases-builds/deps/'
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47 # Detects whether current python interpreter architecture is ARM64 or AMD64
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48 # If running AMD64 python on an ARM64 Windows, this still intentionally returns AMD64
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49 def find_python_arch():
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50 import sysconfig
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51 arch = sysconfig.get_platform().lower()
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52 if 'amd64' in arch:
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53 return 'amd64'
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54 if 'arm64' in arch:
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55 return 'arm64'
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56 raise f'Unknown Python sysconfig platform "{arch}" (neither AMD64 or ARM64)'
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59 def make_python_patch():
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60 python_arch = find_python_arch()
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61 package_name = 'pythonarm64' if python_arch == 'arm64' else 'python'
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62 download_url = f'https://www.nuget.org/api/v2/package/{package_name}/{version}'
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63 filename = f'python-{version}-win-{python_arch}.zip'
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64 out_filename = f'python-{version}-{revision}-win-{python_arch}.zip'
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65
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66 if not os.path.exists(filename):
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67 print(f'Downloading python: {download_url} to {filename}')
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68 urllib.request.urlretrieve(download_url, filename)
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69
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70 os.mkdir('python-nuget')
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71 check_call(unzip_cmd() + [os.path.abspath(filename)], cwd='python-nuget')
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72 os.remove(filename)
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73
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74 src_dir = os.path.join('python-nuget', 'tools')
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75 python_exe = os.path.join(src_dir, 'python.exe')
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76 check_call([python_exe, '-m', 'ensurepip', '--upgrade'])
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77 check_call([python_exe, '-m', 'pip', 'install', 'pywin32==310', '--no-warn-script-location'])
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78 check_call([python_exe, '-m', 'pip', 'install', PSUTIL])
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79
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80 check_call(zip_cmd() + [os.path.join('..', '..', out_filename), '.'], cwd=src_dir)
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81 print('Created: %s' % out_filename)
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82
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83 # cleanup if everything went fine
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84 shutil.rmtree('python-nuget')
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85
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86 if '--upload' in sys.argv:
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87 upload_url = upload_base + out_filename
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88 print('Uploading: ' + upload_url)
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89 cmd = ['gsutil', 'cp', '-n', out_filename, upload_url]
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90 print(' '.join(cmd))
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91 check_call(cmd)
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92
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93
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94 def build_python():
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95 if sys.platform.startswith('darwin'):
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96 # Take some rather drastic steps to link openssl and liblzma statically
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97 # and avoid linking libintl completely.
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98 osname = 'macos'
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99 check_call(['brew', 'install', 'openssl', 'xz', 'pkg-config'])
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100 if platform.machine() == 'x86_64':
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101 prefix = '/usr/local'
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102 min_macos_version = '11.0'
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103 elif platform.machine() == 'arm64':
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104 prefix = '/opt/homebrew'
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105 min_macos_version = '11.0'
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106
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107 # Append '-x86_64' or '-arm64' depending on current arch. (TODO: Do
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108 # this for Linux too, move this below?)
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109 osname += '-' + platform.machine()
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110
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111 for f in [os.path.join(prefix, 'lib', 'libintl.dylib'),
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112 os.path.join(prefix, 'include', 'libintl.h'),
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113 os.path.join(prefix, 'opt', 'xz', 'lib', 'liblzma.dylib'),
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114 os.path.join(prefix, 'opt', 'openssl', 'lib', 'libssl.dylib'),
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115 os.path.join(prefix, 'opt', 'openssl', 'lib', 'libcrypto.dylib')]:
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116 if os.path.exists(f):
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117 os.remove(f)
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118 os.environ['PKG_CONFIG_PATH'] = os.path.join(prefix, 'opt', 'openssl', 'lib', 'pkgconfig')
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119 else:
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120 osname = 'linux'
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121
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122 src_dir = 'cpython'
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123 if os.path.exists(src_dir):
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124 check_call(['git', 'fetch'], cwd=src_dir)
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125 else:
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126 check_call(['git', 'clone', 'https://github.com/python/cpython'])
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127 check_call(['git', 'checkout', 'v' + version], cwd=src_dir)
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128
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129 env = os.environ
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130 if sys.platform.startswith('darwin'):
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131 # Specify the min OS version we want the build to work on
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132 min_macos_version_line = '-mmacosx-version-min=' + min_macos_version
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133 build_flags = min_macos_version_line + ' -Werror=partial-availability'
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134 # Build against latest SDK, but issue an error if using any API that would not work on the min OS version
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135 env = env.copy()
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136 env['MACOSX_DEPLOYMENT_TARGET'] = min_macos_version
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137 configure_args = ['CFLAGS=' + build_flags, 'CXXFLAGS=' + build_flags, 'LDFLAGS=' + min_macos_version_line]
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138 else:
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139 configure_args = []
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140 check_call(['./configure'] + configure_args, cwd=src_dir, env=env)
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141 check_call(['make', '-j', str(multiprocessing.cpu_count())], cwd=src_dir, env=env)
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142 check_call(['make', 'install', 'DESTDIR=install'], cwd=src_dir, env=env)
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143
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144 install_dir = os.path.join(src_dir, 'install')
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145
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146 # Install requests module. This is needed in particular on macOS to ensure
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147 # SSL certificates are available (certifi in installed and used by requests).
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148 pybin = os.path.join(src_dir, 'install', 'usr', 'local', 'bin', 'python3')
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149 pip = os.path.join(src_dir, 'install', 'usr', 'local', 'bin', 'pip3')
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150 check_call([pybin, '-m', 'ensurepip', '--upgrade'])
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151 check_call([pybin, pip, 'install', 'requests==2.32.3'])
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152
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153 # Install psutil module. This is needed by emrun to track when browser
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154 # process quits.
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155 check_call([pybin, pip, 'install', PSUTIL])
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156
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157 dirname = 'python-%s-%s' % (version, revision)
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158 if os.path.isdir(dirname):
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159 print('Erasing old build directory ' + dirname)
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160 shutil.rmtree(dirname)
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161 os.rename(os.path.join(install_dir, 'usr', 'local'), dirname)
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162 tarball = 'python-%s-%s-%s.tar.gz' % (version, revision, osname)
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163 shutil.rmtree(os.path.join(dirname, 'lib', 'python' + major_minor_version, 'test'))
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164 shutil.rmtree(os.path.join(dirname, 'include'))
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165 for lib in glob.glob(os.path.join(dirname, 'lib', 'lib*.a')):
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166 os.remove(lib)
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167 check_call(['tar', 'zcvf', tarball, dirname])
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168
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169 print('Created: %s' % tarball)
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170 if '--upload' in sys.argv:
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171 print('Uploading: ' + upload_base + tarball)
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172 check_call(['gsutil', 'cp', '-n', tarball, upload_base + tarball])
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173
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174
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175 def main():
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176 if sys.platform.startswith('win') or '--win32' in sys.argv:
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177 make_python_patch()
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178 else:
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179 build_python()
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180 return 0
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181
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182
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183 if __name__ == '__main__':
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184 sys.exit(main())