通过python文件的Robot框架的命令行参数

Question

language : python - 3.7.3 Robot framework - 3.1.1 proficiency : Novice

I want to pass arguments to python file variables from command prompt and then want to print the same from robot file by adding python file as variable.

cmd (Variables) --> python file --> robot (print those variables) 

But apparently none of the try has yielded expected results. Any guidance will be highly appreciated.

Note: Both Robot and Python files are under same directory in pycharm IDE.

Command Line:-

1st try: robot -d Report -V test.py Test_sample.robot|py test.py test@test.com test@123 QA1

2nd try: robot -d Report Test_sample.robot|py test.py test@test.com test@123 QA1

3rd try: robot -d Report --Variablefile py test.py Test_sample.robot|py test.py test@test.com test@123 QA1

4th try: robot -d Report -V | py test.py test@test.com test@123 QA1| Test_sample.robot

Python:-

import sys

username = str(sys.argv[1])
password = str(sys.argv[2])
environment = str(sys.argv[3])

Robot:-

*** Settings ***
Library     SeleniumLibrary
Library     Collections
Variables  test.py

*** Test Cases ***
Pass variables from Python File

        log to console  The usr is: "${username}"
        log to console  The pwd is: "${password}"
        log to console  The env is: "${environment}"

Expected:

The usr is: test@test.com The pwd is: test@123 The env is: QA1

Actual:

[ ERROR ] Unexpected error: OSError: [Errno 22] Invalid argument
Traceback (most recent call last):
  File "<<Dir path>>\python\python37-32\lib\site-packages\robot\utils\application.py", line 83, in _execute
    rc = self.main(arguments, **options)
  File "<<Dir path>>\python\python37-32\lib\site-packages\robot\run.py", line 439, in main
    result = suite.run(settings)
  File "<<Dir path>>\python\python37-32\lib\site-packages\robot\running\model.py", line 222, in run
    self.visit(runner)
  File "<<Dir path>>\python\python37-32\lib\site-packages\robot\model\testsuite.py", line 168, in visit
    visitor.visit_suite(self)
  File "<<Dir path>>\python\python37-32\lib\site-packages\robot\model\visitor.py", line 84, in visit_suite
    if self.start_suite(suite) is not False:
  File "<<Dir path>>\python\python37-32\lib\site-packages\robot\running\runner.py", line 83, in start_suite
    test_count=suite.test_count))
  File "<<Dir path>>\python\python37-32\lib\site-packages\robot\output\output.py", line 51, in start_suite
    LOGGER.start_suite(suite)
  File "<<Dir path>>\python\python37-32\lib\site-packages\robot\output\logger.py", line 200, in start_suite
    logger.start_suite(suite)
  File "<<Dir path>>\python\python37-32\lib\site-packages\robot\output\console\verbose.py", line 35, in start_suite
    self._writer.suite_separator()
  File "<<Dir path>>\python\python37-32\lib\site-packages\robot\output\console\verbose.py", line 104, in suite_separator
    self._fill('=')
  File "<<Dir path>>\python\python37-32\lib\site-packages\robot\output\console\verbose.py", line 110, in _fill
    self._stdout.write('%s\n' % (char * self._width))
  File "<<Dir path>>\python\python37-32\lib\site-packages\robot\output\console\highlighting.py", line 53, in write
    self.flush()
  File "<<Dir path>>\python\python37-32\lib\site-packages\robot\output\console\highlighting.py", line 66, in flush
    self.stream.flush()
Exception ignored in: <_io.TextIOWrapper name='<stdout>' mode='w' encoding='cp1252'>
OSError: [Errno 22] Invalid argument

Answer 1

In a comment you wrote:

My aim is to pass credentials from command line.

Robot has support for that using the --variable (and -v ) command line option. Using this will overwrite any imported variable or variable defined in a robot file.

For example, you can set defaults for your credentials inside the test itself:

*** Variables ***
${USER}         test@test.com
${PASSWORD}     test@123
${ENVIRONMENT}  QA1

*** Test cases ***
Example
    log to console  \n*****
    log to console  username: ${USER}
    log to console  password: ${PASSWORD}
    log to console  environment: ${ENVIRONMENT}

You can modify those values from the command line using -v or --variable :

$ robot -v USER:bob -v PASSWORD:bob@123  -v ENVIRONMENT:QA2 ...

If you need to access these variables in a python function without passing them in, you can use the built-in keyword get_variable_value to fetch the value:

from robot.libraries.BuiltIn import BuiltIn
...
user = BuiltIn().get_variable_value('${USER}')

Answer 2

I am not quite sure about this, I am guessing we should also pass the name of the script to sys.argv

sys.argv[0] in the below example, is the name of the script passed argument.

import sys
print "This is the name of the script: ", sys.argv[0]
print "Number of arguments: ", len(sys.argv)
print "The arguments are: " , str(sys.argv)

reference: https://www.pythonforbeginners.com/system/python-sys-argv