Fixing some review remarks

.travis.yml

@@ -39,7 +39,7 @@ jobs:
         - PYTHON=C:\\Python36\\python
 
     - &linux_s390x_36
-      name: Linux | s390x | Python 365
+      name: Linux | s390x | Python 3.6
       language: python
       python: 3.6
       services: docker

CI.md

@@ -1,10 +1,10 @@
 This is a summary of the Python versions and platforms covered by the different CI platforms:
 
-|          | 3.6                          | 3.7                                               | 3.8              |
-|----------|------------------------------|---------------------------------------------------|------------------|
-| Linux    | Travis CI / CircleCI         | AppVeyor / GitHub Actions                         | Azure Pipelines  |
+|          | 3.6                          | 3.7                                                | 3.8              |
+|----------|------------------------------|----------------------------------------------------|------------------|
+| Linux    | Travis CI / CircleCI         | AppVeyor / GitHub Actions                          | Azure Pipelines  |
 | macOS    | CircleCI                     | AppVeyor / Travis CI¹ / CircleCI / GitHub Actions  | Azure Pipelines  |
-| Windows  | Travis CI / Azure Pipelines  | AppVeyor / GitHub Actions                         | Azure Pipelines  |
+| Windows  | Travis CI / Azure Pipelines  | AppVeyor / GitHub Actions                          | Azure Pipelines  |
 
 > ¹ Python version not really pinned, but dependent on the (default) version of image used.
 

cibuildwheel/bashlex_eval.py

@@ -1,7 +1,7 @@
 import shlex
 import subprocess
 
-from typing import Dict, List, NamedTuple, Optional
+from typing import Dict, NamedTuple
 
 import bashlex  # type: ignore
 
@@ -45,20 +45,20 @@ def evaluate_word_node(node: bashlex.ast.node, context: NodeExecutionContext) ->
     word_start = node.pos[0]
     word_end = node.pos[1]
     word_string = context.input[word_start:word_end]
-    letters: List[Optional[str]] = list(word_string)
+    letters = list(word_string)
 
     for part in node.parts:
         part_start = part.pos[0] - word_start
         part_end = part.pos[1] - word_start
 
         # Set all the characters in the part to None
         for i in range(part_start, part_end):
-            letters[i] = None
+            letters[i] = ''
 
         letters[part_start] = evaluate_node(part, context=context)
 
     # remove the None letters and concat
-    value = ''.join(l for l in letters if l is not None)
+    value = ''.join(letters)
 
     # apply bash-like quotes/whitespace treatment
     return ' '.join(word.strip() for word in shlex.split(value))

cibuildwheel/util.py

@@ -3,7 +3,7 @@
 from fnmatch import fnmatch
 from time import sleep
 
-from typing import Dict, List, NamedTuple, Optional, Type, TypeVar
+from typing import Dict, List, NamedTuple, Optional
 
 from .environment import ParsedEnvironment
 
@@ -82,17 +82,14 @@ def download(url: str, dest: str) -> None:
         response.close()
 
 
-DependencyConstraints_T = TypeVar('DependencyConstraints_T', bound='DependencyConstraints')
-
-
 class DependencyConstraints:
     def __init__(self, base_file_path: str):
         assert os.path.exists(base_file_path)
         self.base_file_path = os.path.abspath(base_file_path)
 
-    @classmethod
-    def with_defaults(cls: Type[DependencyConstraints_T]) -> DependencyConstraints_T:
-        return cls(
+    @staticmethod
+    def with_defaults() -> 'DependencyConstraints':
+        return DependencyConstraints(
             base_file_path=os.path.join(os.path.dirname(__file__), 'resources', 'constraints.txt')
         )
 

cibuildwheel/windows.py

@@ -82,9 +82,8 @@ def install_cpython(version: str, arch: str, nuget: str) -> str:
     return installation_path
 
 
-def install_pypy(version: str, arch: str, url: Optional[str]) -> str:
+def install_pypy(version: str, arch: str, url: str) -> str:
     assert arch == '32'
-    assert url is not None
     # Inside the PyPy zip file is a directory with the same name
     zip_filename = url.rsplit('/', 1)[-1]
     installation_path = os.path.join('C:\\cibw', os.path.splitext(zip_filename)[0])
@@ -107,6 +106,7 @@ def setup_python(python_configuration: PythonConfiguration, dependency_constrain
     if python_configuration.identifier.startswith('cp'):
         installation_path = install_cpython(python_configuration.version, python_configuration.arch, nuget)
     elif python_configuration.identifier.startswith('pp'):
+        assert python_configuration.url is not None
         installation_path = install_pypy(python_configuration.version, python_configuration.arch, python_configuration.url)
     else:
         raise ValueError("Unknown Python implementation")