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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def click_on_label(step, label):
 """ Click on a label """


    with AssertContextManager(step):
        elem = world.browser.find_element_by_xpath(str(
            '//label[normalize-space(text()) = "%s"]' % label))
        elem.click()