fix PyLint warnings

9 files changed, 19 insertions, 18 deletions

diff --git a/project/boost/toolchain.py b/project/boost/toolchain.py
index cce06a4..37f24ea 100644
--- a/project/boost/toolchain.py
+++ b/project/boost/toolchain.py
@@ -452,6 +452,6 @@ class Clang(ConfigFile):
 class ClangCL(Toolchain):
     def get_b2_args(self):
         return super().get_b2_args() + [
-            f'toolset=clang-win',
+            'toolset=clang-win',
             'define=BOOST_USE_WINDOWS_H',
         ]
diff --git a/project/ci/appveyor/generator.py b/project/ci/appveyor/generator.py
index dc1fa13..19c11df 100644
--- a/project/ci/appveyor/generator.py
+++ b/project/ci/appveyor/generator.py
@@ -15,7 +15,7 @@ class Image(Enum):
     VS_2019 = 'Visual Studio 2019'
 
     def __str__(self):
-        return self.value
+        return str(self.value)
 
     @staticmethod
     def parse(s):
@@ -36,7 +36,7 @@ class Generator(Enum):
     VS_2019 = 'Visual Studio 16 2019'
 
     def __str__(self):
-        return self.value
+        return str(self.value)
 
     @staticmethod
     def from_image(image):
diff --git a/project/ci/cmake.py b/project/ci/cmake.py
index df2b55a..2f801de 100644
--- a/project/ci/cmake.py
+++ b/project/ci/cmake.py
@@ -26,7 +26,7 @@ def _parse_args(dirs, argv=None):
                         help='set Boost directory path')
     parser.add_argument('--toolset', metavar='TOOLSET',
                         type=ToolchainType.parse,
-                        help=f'toolset to use')
+                        help='toolset to use')
     parser.add_argument('cmake_args', nargs='*', metavar='CMAKE_ARG', default=[],
                         help='additional CMake arguments, to be passed verbatim')
     return parser.parse_args(argv)
diff --git a/project/cmake/toolchain.py b/project/cmake/toolchain.py
index 7c96628..7966192 100644
--- a/project/cmake/toolchain.py
+++ b/project/cmake/toolchain.py
@@ -189,7 +189,8 @@ class Makefile(Toolchain):
     def _get_config_path(build_dir):
         return os.path.join(build_dir, 'custom_toolchain.cmake')
 
-    def _get_makefile_generator(self):
+    @staticmethod
+    def _get_makefile_generator():
         if on_windows():
             if shutil.which('mingw32-make'):
                 return 'MinGW Makefiles'
diff --git a/project/configuration.py b/project/configuration.py
index 50489fa..4b25c6e 100644
--- a/project/configuration.py
+++ b/project/configuration.py
@@ -16,7 +16,7 @@ class Configuration(Enum):
     RELEASE = 'Release'
 
     def __str__(self):
-        return self.value
+        return str(self.value)
 
     @staticmethod
     def all():
@@ -26,8 +26,8 @@ class Configuration(Enum):
     def parse(s):
         try:
             return Configuration(s)
-        except ValueError:
-            raise argparse.ArgumentTypeError(f'invalid configuration: {s}')
+        except ValueError as e:
+            raise argparse.ArgumentTypeError(f'invalid configuration: {s}') from e
 
     def to_boost_variant(self):
         '''Roughly maps CMake's CMAKE_BUILD_TYPE to Boost's variant.
diff --git a/project/linkage.py b/project/linkage.py
index 7019049..ffef071 100644
--- a/project/linkage.py
+++ b/project/linkage.py
@@ -12,7 +12,7 @@ class Linkage(Enum):
     SHARED = 'shared'
 
     def __str__(self):
-        return self.value
+        return str(self.value)
 
     @staticmethod
     def all():
@@ -22,5 +22,5 @@ class Linkage(Enum):
     def parse(s):
         try:
             return Linkage(s)
-        except ValueError:
-            raise argparse.ArgumentTypeError(f'invalid linkage: {s}')
+        except ValueError as e:
+            raise argparse.ArgumentTypeError(f'invalid linkage: {s}') from e
diff --git a/project/os.py b/project/os.py
index 53b64e1..eaa63db 100644
--- a/project/os.py
+++ b/project/os.py
@@ -13,7 +13,7 @@ class OS(Enum):
     CYGWIN = 'Cygwin'
 
     def __str__(self):
-        return self.value
+        return str(self.value)
 
     @staticmethod
     def current():
diff --git a/project/platform.py b/project/platform.py
index 8eb7f3e..d25827b 100644
--- a/project/platform.py
+++ b/project/platform.py
@@ -15,7 +15,7 @@ class Platform(Enum):
     X64 = 'x64'
 
     def __str__(self):
-        return self.value
+        return str(self.value)
 
     @staticmethod
     def native():
@@ -35,8 +35,8 @@ class Platform(Enum):
                 # AppVeyor convention:
                 return Platform.X86
             return Platform(s)
-        except ValueError:
-            raise argparse.ArgumentTypeError(f'invalid platform: {s}')
+        except ValueError as e:
+            raise argparse.ArgumentTypeError(f'invalid platform: {s}') from e
 
     def get_address_model(self):
         '''Maps to Boost's address-model.'''
diff --git a/project/toolchain.py b/project/toolchain.py
index d931c6b..4d10872 100644
--- a/project/toolchain.py
+++ b/project/toolchain.py
@@ -31,7 +31,7 @@ class ToolchainType(Enum):
     CLANG_CL = 'clang-cl'
 
     def __str__(self):
-        return self.value
+        return str(self.value)
 
     @staticmethod
     def all():
@@ -41,5 +41,5 @@ class ToolchainType(Enum):
     def parse(s):
         try:
             return ToolchainType(s)
-        except ValueError:
-            raise argparse.ArgumentTypeError(f'invalid toolset: {s}')
+        except ValueError as e:
+            raise argparse.ArgumentTypeError(f'invalid toolset: {s}') from e