近日在使用selenium+python3.6爬取一个网站时遇到这个问题：

Traceback (most recent call last):
  File "D:/pythoncode/spider/spiderforQA.py", line 17, in <module>
    wait=WebDriverWait(driver,10).until(EC.presence_of_element_located(By.XPATH,'//*[@id="heading0"]/a'))
TypeError: __init__() takes 2 positional arguments but 3 were given

该问题的原因是EC.presence_of_element_located()方法传参的问题，往该方法传参数时需要将参数用“（）”括起来使其作为一个整体，而不是单独传入。如下所示：
将：WebDriverWait(driver,10).until(EC.presence_of_element_located(By.XPATH,'//*[@id="heading0"]/a'))
修改为：WebDriverWait(driver,10).until(EC.presence_of_element_located((By.XPATH,'//*[@id="heading0"]/a')))

就OK！

参考：https://stackoverflow.com/questions/39957316/typeerror-init-takes-2-positional-arguments-but-3-were-given