我必须将字符串格式化为特定的格式，但不幸的是，我的所有尝试都失败了。
# What I want:
//*[@id="ember205"]
# What I am getting:
//*[@id=ember205]
# Additional details, where I need it and the way I am constructing it:
moveToStep = str("ember"+str(int(199)+int(step_number * 3)))
driver.find_element_by_xpath("//*[@id="+moveToStep+"]").click()
任何帮助将非常感激
