"[Errno 2]没有这样的文件或目录：'solc‘“使用py-solc和solidity

Question

I安装了py-solc和solidity:

solc，solidity编译器命令行接口版本: 0.4.16+commit.d7661dd9.Darwin.appleclang

并在python中运行以下代码(有一个契约源代码示例)：

from solc import compile_source, compile_files, link_code

    source = """
    pragma solidity ^0.4.2;
    contract Example {
        string s="Hello World!";
        function set_s(string new_s) {
            s = new_s;
        }
        function get_s() returns (string) {
            return s;
        }
    }"""

compiled = compile_source(source)

和compile_source()函数返回了以下错误：

Traceback (most recent call last):
  File "<pyshell#3>", line 1, in <module>
    compile_source("pragma solidity ^0.4.0;\n contract Foo {}", output_values=["bin", 'abi'])
  File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/solc/main.py", line 106, in compile_source
    stdoutdata, stderrdata, command, proc = solc_wrapper(**compiler_kwargs)
  File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/solc/utils/string.py", line 85, in inner
    return force_obj_to_text(fn(*args, **kwargs))
  File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/solc/wrapper.py", line 155, in solc_wrapper
    stderr=subprocess.PIPE)
  File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/subprocess.py", line 947, in __init__
    restore_signals, start_new_session)
  File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/subprocess.py", line 1551, in _execute_child
    raise child_exception_type(errno_num, err_msg)
FileNotFoundError: [Errno 2] No such file or directory: 'solc'

如何解决此问题并使用py-solc?

进行编译？

Answer 1

问题是solc没有安装在您的pc上。把它装进去

sudo add-apt-repository ppa:ethereum/ethereum
sudo apt-get update
sudo apt-get install solc

或者你可以去这里

Answer 2

我也遇到过这种情况。对我来说，这是因为切换了python环境。无论如何，这可以通过安装py-solc或更好的solc-select来解决。

pip3 install solc-select

Slyther repo 问题.

Answer 3

要求py-solc安装solc为了你还有一个实验特性：

以下任何一个版本的solc都可以在列出的平台上使用py-solc安装。

• v0.4.1 (linux)
• v0.4.2 (linux)
• v0.4.6 (linux)
• v0.4.7 (linux)
• v0.4.8 (linux/osx)
• v0.4.9 (linux)
• v0.4.11 (linux/osx)
• v0.4.12 (linux/osx)
• v0.4.13 (linux/osx)
• v0.4.14 (linux/osx)
• v0.4.15 (linux/osx)
• v0.4.16 (linux/osx)
• v0.4.17 (linux/osx)

安装可以通过命令行完成：$ python -m solc.install v0.4.17