python函数调用语法... result = foo() ['abc'] [英] python function call syntax ... result = foo() ['abc']

问题描述

number = droid.readPhoneState()['result']['incomingNumber']

此语法中的result"和incomingNumber"是什么——它们不是参数吗?

What are 'result' and 'incomingNumber' in this syntax -- are they not parameters?

它们与函数readPhoneState有什么关系?

How are they related to the function readPhoneState?

import android

droid = android.Android()
droid.startTrackingPhoneState()

number = droid.readPhoneState()['result']['incomingNumber']

if number != None:
  droid.speak('Call from '+str(number))
else:
  droid.makeToast('No incoming call')

推荐答案

droid.readPhoneState() 返回一个字典.等效代码:

droid.readPhoneState() returns a dict of dicts. Equivalent code:

outerDict = droid.readPhoneState()
innerDict = outerDict['result']
number = innerDict['incomingNumber']

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