check key is present in python dictionary

This question already has an answer here:

Check if a given key already exists in a dictionary 18 answers

How to check if a key exists in an inner dictionary inside a dictionary in python? 3 answers

---

if 'node2' in data:
    print "node2 Present"
else:
    print "node2Not present"

这是确定密钥是否在字典中的完美适当方式，不幸'node2'是， 'node2'不在你的字典中， ' node2'是（注意空间）：

if ' node2' in data:
    print "node2 Present"
else:
    print "node2Not present"

---

data = {'node2': {'Status': ' online', 'TU': ' 900', 'Link': ' up', 'Port': ' a0a-180', 'MTU': ' 9000'}, ' node1': {'Status': ' online', 'TU': ' 900', 'Link': ' up', 'Port': ' a0a-180', 'MTU': ' 9000'}}

    if data.has_key('node2'):
        print "== if condition =="
    else:
        print "== else =="

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