Issue 5020 - Part 1: Make compile script PEP8-compliant

compile

 #!/usr/bin/env python
 
-import json
 import os
 import re
 import subprocess
-import warnings
 
 EMSCRIPTEN_PATH = '../emscripten'
 SOURCE_DIR = './compiled'
 SOURCE_FILES = [
-  os.path.join(path, f)
-  for (path, dirs, files) in os.walk(SOURCE_DIR)
-  for f in files
-  if f.endswith('.cpp')
+    os.path.join(path, f)
+    for (path, dirs, files) in os.walk(SOURCE_DIR)
+    for f in files
+    if f.endswith('.cpp')
 ]
 BINDINGS_FILE = os.path.join(SOURCE_DIR, 'bindings.cpp')
 BINDINGS_GENERATOR = os.path.join(SOURCE_DIR, 'bindings.cpp.js')
 BINDINGS_OUTPUT = os.path.join(SOURCE_DIR, 'bindings.js')
 COMPILER_OUTPUT = './lib/compiled.js'
 GENERATION_PARAMS = {
-  'SHELL_FILE': "'%s'" % os.path.abspath(os.path.join(SOURCE_DIR, 'shell.js')),
-  'ASM_JS': 2,  # "almost asm"
-  'TOTAL_MEMORY': 16*1024*1024,
-  'TOTAL_STACK': 1*1024*1024,
-  'ALLOW_MEMORY_GROWTH': 1,
-  'NO_EXIT_RUNTIME': 1,
-  'NO_DYNAMIC_EXECUTION': 1,
-  'NO_FILESYSTEM': 1,
-  'INVOKE_RUN': 0,
-  'TEXTDECODER': 0,
-  'EXPORTED_RUNTIME_METHODS': ['cwrap', 'ccall', 'stringToAscii'],
+    'SHELL_FILE': "'{}'".format(os.path.abspath(os.path.join(SOURCE_DIR,
+                                                             'shell.js'))),
+    'ASM_JS': 2,  # "almost asm"
+    'TOTAL_MEMORY': 16*1024*1024,
+    'TOTAL_STACK': 1*1024*1024,
+    'ALLOW_MEMORY_GROWTH': 1,
+    'NO_EXIT_RUNTIME': 1,
+    'NO_DYNAMIC_EXECUTION': 1,
+    'NO_FILESYSTEM': 1,
+    'INVOKE_RUN': 0,
+    'TEXTDECODER': 0,
+    'EXPORTED_RUNTIME_METHODS': ['cwrap', 'ccall', 'stringToAscii'],
 }
 DEFINES = []
 ADDITIONAL_PARAMS = ['-O3', '-m32', '-std=gnu++14', '--memory-init-file', '0',
-    '--emit-symbol-map']
+                     '--emit-symbol-map']
+
 
 def getenv():
-  path = []
-  env = {}
-  output = subprocess.check_output([
-      '/bin/bash', '-c', os.path.join(EMSCRIPTEN_PATH, 'emsdk_env.sh')])
-  for line in output.splitlines():
-    match = re.search(r'^\s*PATH\s*\+=\s*(.*)', line)
-    if match:
-      path.append(match.group(1))
-    match = re.search(r'^\s*(\w+)\s*=\s*(.*)', line)
-    if match:
-      env[match.group(1)] = match.group(2)
-  env['PATH'] = os.pathsep.join([os.environ['PATH']] + path)
-  return env
+    path = []
+    env = {}
+    output = subprocess.check_output([
+        '/bin/bash', '-c', os.path.join(EMSCRIPTEN_PATH, 'emsdk_env.sh')
+    ])
+    for line in output.splitlines():
+        match = re.search(r'^\s*PATH\s*\+=\s*(.*)', line)
+        if match:
+            path.append(match.group(1))
+        match = re.search(r'^\s*(\w+)\s*=\s*(.*)', line)
+        if match:
+            env[match.group(1)] = match.group(2)
+        env['PATH'] = os.pathsep.join([os.environ['PATH']] + path)
+    return env
+
 
 def generate_bindings(env):
-  params = [os.path.join(env['EMSCRIPTEN'], 'emcc'), BINDINGS_FILE,
-    '-o', BINDINGS_GENERATOR, '-std=gnu++14', '-DPRINT_BINDINGS',
-    '-s', 'WARN_ON_UNDEFINED_SYMBOLS=0',
-  ]
-  subprocess.check_call(params, env=env)
+    params = [
+        os.path.join(env['EMSCRIPTEN'], 'emcc'), BINDINGS_FILE,
+        '-o', BINDINGS_GENERATOR, '-std=gnu++14', '-DPRINT_BINDINGS',
+        '-s', 'WARN_ON_UNDEFINED_SYMBOLS=0',
+    ]
+    subprocess.check_call(params, env=env)
 
-  node = subprocess.check_output('which node', env=env, shell=True).strip();
-  with open(BINDINGS_OUTPUT, 'w') as file:
-    subprocess.check_call([node, BINDINGS_GENERATOR], env=env, stdout=file)
+    node = subprocess.check_output('which node', env=env, shell=True).strip()
+    with open(BINDINGS_OUTPUT, 'w') as file:
+        subprocess.check_call([node, BINDINGS_GENERATOR], env=env, stdout=file)
+
 
 def run_compiler(env):
-  params = [
-    os.path.join(env['EMSCRIPTEN'], 'emcc'),
-    '-o', COMPILER_OUTPUT,
-    '--post-js', BINDINGS_OUTPUT,
-  ]
-  params.extend(SOURCE_FILES)
-  params.extend('-D' + flag for flag in DEFINES)
-  for key, value in GENERATION_PARAMS.iteritems():
-    params.extend(['-s', '%s=%s' % (key, str(value))])
-  params.extend(ADDITIONAL_PARAMS)
-  subprocess.check_call(params, env=env)
+    params = [
+        os.path.join(env['EMSCRIPTEN'], 'emcc'),
+        '-o', COMPILER_OUTPUT,
+        '--post-js', BINDINGS_OUTPUT,
+    ]
+    params.extend(SOURCE_FILES)
+    params.extend('-D' + flag for flag in DEFINES)
+    for key, value in GENERATION_PARAMS.iteritems():
+        params.extend(['-s', '{}={}'.format(key, str(value))])
+    params.extend(ADDITIONAL_PARAMS)
+    subprocess.check_call(params, env=env)
+
 
 if __name__ == '__main__':
-  env = getenv()
-  generate_bindings(env)
-  run_compiler(env)
+    env = getenv()
+    generate_bindings(env)
+    run_compiler(env)