fallback to virtualenv if venv fails to create

Fix #793

README.md

@@ -79,7 +79,7 @@ Like Pip, PDM provides an installation script that will install PDM into an isol
 **For Linux/Mac**
 
 ```bash
-curl -sSL https://raw.githubusercontent.com/pdm-project/pdm/main/install-pdm.py | python -
+curl -sSL https://raw.githubusercontent.com/pdm-project/pdm/main/install-pdm.py | python3 -
 ```
 
 **For Windows**

README_zh.md

@@ -49,9 +49,9 @@ foo
 - 具备一个完备的插件系统
 - [PEP 621] 元数据格式
 
-[PEP 517]: https://www.python.org/dev/peps/pep-0517
-[PEP 582]: https://www.python.org/dev/peps/pep-0582
-[PEP 621]: https://www.python.org/dev/peps/pep-0621
+[pep 517]: https://www.python.org/dev/peps/pep-0517
+[pep 582]: https://www.python.org/dev/peps/pep-0582
+[pep 621]: https://www.python.org/dev/peps/pep-0621
 
 ## 为什么不用虚拟环境?
 
@@ -75,7 +75,7 @@ PDM 需要 Python 3.7 或更高版本。
 **Linux/Mac 安装命令**
 
 ```bash
-curl -sSL https://raw.githubusercontent.com/pdm-project/pdm/main/install-pdm.py | python -
+curl -sSL https://raw.githubusercontent.com/pdm-project/pdm/main/install-pdm.py | python3 -
 ```
 
 **Windows 安装命令**

docs/docs/index.md

@@ -35,7 +35,7 @@ Like Pip, PDM provides an installation script that will install PDM into an isol
 === "Linux/Mac"
 
     ```bash
-    curl -sSL https://raw.githubusercontent.com/pdm-project/pdm/main/install-pdm.py | python -
+    curl -sSL https://raw.githubusercontent.com/pdm-project/pdm/main/install-pdm.py | python3 -
     ```
 
 === "Windows"

install-pdm.py

@@ -247,7 +247,9 @@ class Installer:
 
         try:
             import venv
-        except ModuleNotFoundError:
+
+            venv.create(venv_path, clear=False, with_pip=True)
+        except (ModuleNotFoundError, subprocess.CalledProcessError):
             try:
                 import virtualenv
             except ModuleNotFoundError:
@@ -264,8 +266,6 @@ class Installer:
                     )
             else:
                 virtualenv.cli_run([str(venv_path)])
-        else:
-            venv.create(venv_path, clear=False, with_pip=True)
 
         return venv_path
 

news/793.misc.md

+Fix an installation failure of the bootstrap script on MacOS Catalina.
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