FileNotFoundError: [WinError 2] The system cannot find the file specified

[sjtupingjian]

• py-solc Version: 2.1.0
• solc Version: 0.4.17
• Python Version: 3.6
• OS: win

What was wrong?

I try to compile a contract like this:

import json
import web3
import sys

from solc import compile_standard,compile_source,compile_files, link_code
from web3.contract import ConciseContract

compile_standard({'language': 'Solidity','sources': 'MetaCoin.sol'})

Executing this function returns an error:

Traceback (most recent call last):
  File "C:/Users/com/PycharmProjects/test/testCompile.py", line 35, in <module>
    compiled_sol = compile_source(contract_source_code)
  File "C:\Users\com\PycharmProjects\test\venv\lib\site-packages\solc\main.py", line 106, in compile_source
    stdoutdata, stderrdata, command, proc = solc_wrapper(**compiler_kwargs)
  File "C:\Users\com\PycharmProjects\test\venv\lib\site-packages\solc\utils\string.py", line 85, in inner
    return force_obj_to_text(fn(*args, **kwargs))
  File "C:\Users\com\PycharmProjects\test\venv\lib\site-packages\solc\wrapper.py", line 155, in solc_wrapper
    stderr=subprocess.PIPE)
  File "D:\Anaconda3\lib\subprocess.py", line 709, in __init__
    restore_signals, start_new_session)
  File "D:\Anaconda3\lib\subprocess.py", line 997, in _execute_child
    startupinfo)
FileNotFoundError: [WinError 2] The system cannot find the file specified

How can I fix it?

Cute Animal Picture

put a cute animal picture here.

[dylanjw]

Can you add some checks for the solc executable and the source file? e.g.:

import os
source_path = 'MetaCoin.sol'
if not os.path.exists(source_path):
    raise FileNotFoundError("File not found at path: {0}".format(os.path.realpath(source_path)) 
if not os.path.exists('solc'):
    raise FileNotFoundError("solc executable not found.  Is solc installed?")

[sjtupingjian]

Thanks for reply!

It returns error:

Traceback (most recent call last):
  File "C:/Users/com/PycharmProjects/test/testCompile.py", line 17, in <module>
    raise FileNotFoundError("solc executable not found.  Is solc installed?")
FileNotFoundError: solc executable not found.  Is solc installed?

I am still confused because the solc compiler was installed and it does work in commandline:

C:\Users\com>solcjs --help
Usage: AppData\Roaming\npm\node_modules\solc\solcjs [options] [input_file...]

Options:
  --version         Show version number                                [boolean]

  --optimize        Enable bytecode optimizer.                         [boolean]

  --bin             Binary of the contracts in hex.                    [boolean]

  --abi             ABI of the contracts.                              [boolean]

  --standard-json   Turn on Standard JSON Input / Output mode.         [boolean]

  --output-dir, -o  Output directory for the contracts.                 [string]

  --help            Show help                                          [boolean]

[dylanjw]

the solcjs package only gives the solc binary embedded in a js file behind js bindings. It wont work for py-solc, which requires the solc binary to be in the executable path.

Unfortunately the handy py-solc installer helper does not work on windows:

$ python -m solc.install v0.4.19

You can download a compiled binary from https://github.com/ethereum/solidity/releases. Then either place the binary in you executable path, or set the SOLC_BINARY environmental variable with the path of the solc executable.

[dylanjw]

#48

[ppLorins]

Same issue. solc is available in the commond line , but throws exceptions by this snippet :

if not os.path.exists('solc'):
    raise FileNotFoundError("solc executable not found.  Is solc installed?")

Win7 solc:0.4.25+commit.59dbf8f1.Windows.msvc