Force Platformio to use Python3?

PlatformIO Core
#1

I’m having trouble building a project:

Processing emontx (platform: atmelavr; framework: arduino; board: uno)
-------------------------------------------------------------------------------------------------------------------------------------------------------------------
Verbose mode can be enabled via `-v, --verbose` option
CONFIGURATION: https://docs.platformio.org/page/boards/atmelavr/uno.html
PLATFORM: Atmel AVR (3.1.0) > Arduino Uno
HARDWARE: ATMEGA328P 16MHz, 2KB RAM, 31.50KB Flash
DEBUG: Current (avr-stub) On-board (avr-stub, simavr)
PACKAGES: 
 - framework-arduino-avr 5.1.0 
 - toolchain-atmelavr 1.50400.190710 (5.4.0)
Converting src.ino
LDF: Library Dependency Finder -> http://bit.ly/configure-pio-ldf
LDF Modes: Finder ~ chain, Compatibility ~ soft
ValueError: Invalid simple block 'c057b5f4c0':
  File "/usr/local/lib/python2.7/dist-packages/platformio/builder/main.py", line 170:
    env.SConscript("$BUILD_SCRIPT")
  File "/home/glyn/.platformio/packages/tool-scons/script/../engine/SCons/Script/SConscript.py", line 541:
    return _SConscript(self.fs, *files, **subst_kw)
  File "/home/glyn/.platformio/packages/tool-scons/script/../engine/SCons/Script/SConscript.py", line 250:
    exec _file_ in call_stack[-1].globals
  File "/home/glyn/.platformio/platforms/atmelavr/builder/main.py", line 162:
    target_elf = env.BuildProgram()
  File "/home/glyn/.platformio/packages/tool-scons/script/../engine/SCons/Environment.py", line 224:
    return self.method(*nargs, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/platformio/builder/tools/platformio.py", line 62:
    env.ProcessProjectDeps()
  File "/home/glyn/.platformio/packages/tool-scons/script/../engine/SCons/Environment.py", line 224:
    return self.method(*nargs, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/platformio/builder/tools/platformio.py", line 140:
    project_lib_builder = env.ConfigureProjectLibBuilder()
  File "/home/glyn/.platformio/packages/tool-scons/script/../engine/SCons/Environment.py", line 224:
    return self.method(*nargs, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/platformio/builder/tools/piolib.py", line 1062:
    project.install_dependencies()
  File "/usr/local/lib/python2.7/dist-packages/platformio/builder/tools/piolib.py", line 886:
    if lm.get_package(spec):
  File "/usr/local/lib/python2.7/dist-packages/platformio/package/manager/base.py", line 234:
    spec = self.ensure_spec(spec)
  File "/usr/local/lib/python2.7/dist-packages/platformio/package/manager/base.py", line 102:
    return spec if isinstance(spec, PackageSpec) else PackageSpec(spec)
  File "/usr/local/lib/python2.7/dist-packages/platformio/package/meta.py", line 119:
    self._parse(raw)
  File "/usr/local/lib/python2.7/dist-packages/platformio/package/meta.py", line 222:
    raw = parser(raw)
  File "/usr/local/lib/python2.7/dist-packages/platformio/package/meta.py", line 245:
    self.requirements = tokens[1].strip()
  File "/usr/local/lib/python2.7/dist-packages/platformio/package/meta.py", line 162:
    else semantic_version.SimpleSpec(str(value))
  File "/usr/local/lib/python2.7/dist-packages/semantic_version/base.py", line 618:
    self.clause = self._parse_to_clause(expression)
  File "/usr/local/lib/python2.7/dist-packages/semantic_version/base.py", line 1014:
    return cls.Parser.parse(expression)
  File "/usr/local/lib/python2.7/dist-packages/semantic_version/base.py", line 1034:
    raise ValueError("Invalid simple block %r" % block)

I think the issue is due to Platformio still using python 2

--------------------------  ----------------------------------------------
PlatformIO Core Executable  /usr/local/bin/platformio
File System Encoding        UTF-8
Locale Encoding             UTF-8
PlatformIO Core             5.0.4
System Type                 linux_x86_64
PlatformIO Core Directory   /home/glyn/.platformio
Python Executable           /usr/bin/python
Platform                    Linux-4.15.0-128-generic-x86_64-with-glibc2.15
Tools & Toolchains          5
Global Libraries            0
Development Platforms       1
Python                      2.7.17-final.0
--------------------------  ----------------------------------------------

I have python3 installed:

python3 --version
Python 3.6.9

I have followed the instructions: Migrating from 5.x to 6.0 — PlatformIO latest documentation

to remove the folder USER_HOME_DIR/.platformio/penv the reinstall pio using the install script, this didn’t seem to make any differance pio is still using python 2.7.17.

How can I force pio to use python3?

#2

The error is independent of your used python version. The lib_deps declaration of your project is invalid (or of old style with @commithash, which doesn’t work in PIO 5).

Can you show the platformio.ini of your project?

It seems you’ve installed PlatformIO using the CLI / pip. I’d suggest you pip uninstall platformio and then pip3 install platformio – but only as a last step.

#3

Ah, you’re correct I have a @commithash in my lib_deps, I’ve just changed to https://github.com/xxx.git#commithash and the project is now compiling again.

Do you think I should try to change pio to use python3 or will 2.7.17 be ok for the moment?

#4

Well technically it states that the minimum version for PlatformIO Core 5.x is Python 3.6 so I think it’s better to upgrade now than before :smiley:. Shouldn’t break anything (except if using extra_scripts in projects that er specific to Python2… unlikely though)

1 Like