Question

我有一个R函数，我使用rpy2从我的Python脚本调用。 R函数打印到stdout; rpy2中是否有一个参数在调用R脚本时使stdout静音？

Answer 1

rpy2允许您将自己与终端的交互重新定义为python函数。

文档中的以下示例显示了如何附加输出到stdout到Python列表（在宏观方案中有限的用处，但它是一个简单的功能示例）：

buf = []
def f(x):
    # function that append its argument to the list 'buf'
    buf.append(x)

# output from the R console will now be appended to the list 'buf'
rinterface.set_writeconsole(f)

date = rinterface.baseenv['date']
rprint = rinterface.baseenv['print']
rprint(date())

# the output is in our list (as defined in the function f above)
print(buf)


# restore default function
rinterface.set_writeconsole(rinterface.consolePrint)

文档在这里：http://rpy2.readthedocs.io/en/version_2.8.x/callbacks.html#console-i-o

Answer 2

@lgautier的答案在rpy2的最新版本中无效，该版本在撰写本文时为3.3.5。

此方法可以附加到一个类上，并且在被调用一次之后，会将R的所有输出捕获到两个属性中。

def capture_r_output(self):
    """
    Will cause all the output that normally goes to the R console,
    to end up instead in a python list.
    """
    # Import module #
    import rpy2.rinterface_lib.callbacks
    # Record output #
    self.stdout = []
    self.stderr = []
    # Dummy functions #
    def add_to_stdout(line): self.stdout.append(line)
    def add_to_stderr(line): self.stderr.append(line)
    # Keep the old functions #
    self.stdout_orig = rpy2.rinterface_lib.callbacks.consolewrite_print
    self.stderr_orig = rpy2.rinterface_lib.callbacks.consolewrite_warnerror
    # Set the call backs #
    rpy2.rinterface_lib.callbacks.consolewrite_print     = add_to_stdout
    rpy2.rinterface_lib.callbacks.consolewrite_warnerror = add_to_stderr

如何在rpy2中将输出静音到stdout？

2 个答案: