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在Python中,我有一个脚本,它从外部来源接收名称为1或多个变量的输入,然后在PLC上查找当前值并将它们返回给客户。Python根据字典中的值返回格式化的字符串
在脚本上,我定义了所有可能的变量以及要显示给客户端的所需格式和单位。
given_variable = "temp1" #Client needs current value of temp1
vars_format = {
"temp1":["%0.1f","C"],
"press1":["%0.2f","bar"],
"temp2":["%d","K"],
"distance":["%0.3f","km"],
"switch":["%d",""]
}
# Logic for finding current plc_value of given_variable
# plc_value is a string that looks like a real number
# ("3.14159"), an integer "3" or a string "Running"
return "%s %s" % (plc_value, vars_format[ given_variable ][1])
如何动态地(根据字典)以所需格式返回plc_value? 在这个例子中,如何获得“23.4 C”而不是“temp1”或“45.21 bar”的“23.39999 C”而不是“press1”的“42.21248 bar”?
我把我的变量改为“不错的源字符串”..谢谢! –