今天遇到一个很奇怪的问题，同样的脚本，同样版本的浏览器，脚本在我的电脑运行正常，浏览器的下载目录能够设置成功，在同事的电脑里运行就不行，一直是浏览器默认的下载目录

分析过程

原因

牺牲自己的摸鱼时间，终于将原因找出来了， selenium的webdriver的 desired_capabilities参数在搞鬼，同事用的python版本是3.7.5， 这个参数在3.7.5版本源码文件里标明是弃用的，但是你用的时候不会像弃用参数chrome_options使用的时候给你个提示

python3.7.5 源码

Args:
- executable_path - Deprecated: path to the executable. If the default is used it assumes the executable is in the $PATH
- port - Deprecated: port you would like the service to run, if left as 0, a free port will be found.
- options - this takes an instance of ChromeOptions
- service_args - Deprecated: List of args to pass to the driver service
- desired_capabilities - Deprecated: Dictionary object with non-browser specific capabilities only, such as "proxy" or "loggingPref".
- service_log_path - Deprecated: Where to log information from the driver. - keep_alive - Deprecated: Whether to configure ChromeRemoteConnection to use HTTP keep-alive.
'''

而在python3.7.9版本中，这个参数不是弃用的，可以正常使用的

"""
Creates a new instance of the chrome driver.

Starts the service and then creates new instance of chrome driver.

:Args:
 - executable_path - path to the executable. If the default is used it assumes the executable is in the $PATH
 - port - port you would like the service to run, if left as 0, a free port will be found.
 - options - this takes an instance of ChromeOptions
 - service_args - List of args to pass to the driver service
 - desired_capabilities - Dictionary object with non-browser specific
   capabilities only, such as "proxy" or "loggingPref".
 - service_log_path - Where to log information from the driver.
 - chrome_options - Deprecated argument for options
 - keep_alive - Whether to configure ChromeRemoteConnection to use HTTP keep-alive.
"""

而脚本里，是使用desired_capabilities这个参数来设置下载目录的

${prefs}    create dictionary    download.default_directory=${currentpath}${/}Doc${/}    download.prompt_for_download=False
    log   ${prefs}
    Call Method    ${driver_options}    add_experimental_option    prefs   ${prefs}
    ${options}=    Call Method    ${driver_options}    to_capabilities
    Create Webdriver    ${bro}    desired_capabilities=${options}

所以同事用python3.7.5运行脚本虽然能够正常运行，但是下载目录却不会设置成功，后面改成使用options参数来设置下载目录，两个python版本都能够运行成功