Question

嘿，我下周有一个使用编译器的作业，教授希望我们编写一个脚本实际上是命令行。我是python的新手，在UNIX上编写脚本。你如何在Python上编写脚本？我需要教程或任何建议

谢谢

我们必须写下这些步骤

对于每个实验，请按以下步骤操作：

For each benchmark directory, change to that directory and compile the code with one of the optimization levels. For example:

cd adpcm
gcc -O0 -o adpcm-O0 adpcm.c

Time the runtime of the executable:

time ./adpcm-O0
Record the “real” time displayed. You might take an average of 3-5 runs to get a stable result.

Use the performance measurement tools

On the Pis:

run rpistat on the executable
e.g. rpistat ./adpcm-O0
that generates a textfile rpistat.txt in the same directory. Record the Cycles and Instructions (use the value in [brackets] for the instruction count).

On the lab workstations:

run perf on the executable
e.g. perf stat ./adpcm-O0
that prints to stdout (you can redirect if you wish). Record the Cycles and Instructions.

Repeat this procedure for all 12 benchmarks and all 4 optimization levels on both machines.
For the fastest version of each benchmark (use lowest cycle count in the case of a tie), profile the application:

gcc -pg -O2 -o adpcm-prof adpcm.c
./adpcm-prof  (This is needed to profile the executable, but you don’t need to record the runtime)
gprof ./adpcm-prof | less
Record the function for which the most execution time is spent.

Answer 1

subprocess.Popen，os.listdir，os.chdir和time.time（）应该有所帮助。这些都是python命令。您可以使用＆＃34; import subprocess＆＃34;来获取子进程模块，使用＆＃34; import os＆＃34;来获取os模块。

要创建Python脚本，只需在* ix上使用您喜欢的文本编辑器编辑文本文件（名为＆＃34;-script＆＃34;对于此示例），内容如下：

#!/usr/bin/python3
# or you can use python 2 with /usr/bin/python

print('hello world')

...并使其可执行：

chmod 755 the-script

...然后你可以像以下一样运行它：

./the-script

HTH

Answer 2

要在shell中调用某些内容，请使用以下命令：

>>> import os
>>> os.system('echo hello')
hello
0
>>>

或

>>> import subprocess >>> subprocess.call(['echo', 'hello']) hello 0 >>>

如果要使用ls之类的命令，请使用以下代码：

>>> import os >>> x = os.popen('ls ~/Desktop').read().split() >>> x ['... ']

我认为这就是您的意思，但如果您可以在问题中添加更多详细信息，那就太棒了。

Answer 3

使用Popen构造函数在python中调用shell命令。看看这个answer

另外，这是另一个代码：

   from subprocess import Popen, PIPE

    output = Popen(['ls -l'], stdout=PIPE, stderr=PIPE, shell=True)
    (out,err) = output.communicate()

out包含来自ls -l的标准输出和err包含来自ls -l </ p>的stderr

为UNIX命令行编写python脚本

3 个答案: