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在Python中,我有一個腳本,它從外部來源接收名稱爲1或多個變量的輸入,然後在PLC上查找當前值並將它們返回給客戶。Python根據字典中的值返回格式化的字符串
在腳本上,我定義了所有可能的變量以及要顯示給客戶端的所需格式和單位。
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])
如何動態地(根據字典)以所需格式返回plc_value? 在這個例子中,如何獲得「23.4 C」而不是「temp1」或「45.21 bar」的「23.39999 C」而不是「press1」的「42.21248 bar」?
我把我的變量改爲「不錯的源字符串」..謝謝! –