Pampy | powerful pattern matching tool

What is pattern matching

Pattern matching is given a pattern , Use this pattern to check whether the sequence or string conforms to this pattern , This technology is often used in natural language processing .

download pampy

pip install pampy

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Single character matching

The following code can complete the matching of a single character in the object , Use _ Indicates the matching result .

from pampy import _,match

a=['a',1,'b',2,'c',3,'d',4]

patter = ['a',1,'b',2,'c',3,'d',_]

action=lambda x: f'result is: {x}'

print(match(a,patter,action))

Execution results ：

>>> python test.py
>>> result is: 4

Match the beginning and the end

For objects that start or end consecutively , We can use this method to achieve fast matching .

from pampy import _,match,HEAD,TAIL

a=['a',1,'b',2,'c',3,'d',4]

patter = [HEAD,_,'b',2,'c',3,TAIL]

action=lambda h,b,t: ({'head':h,'body':b,'tail':t})

print(match(a,patter,action))

Execution results :

>>> python test.py
>>> {'head': 'a', 'body': 1, 'tail': ['d', 4]}

above , We use HEAD Matches the first few characters , In the middle _ Matched a number , At the end we use TAIL With several characters .

Matching dictionary key

When we only know part of a dictionary , But want to get something value Of key when , Get twice the result with half the effort in this way .

from pampy import _,match,HEAD,TAIL

my_dic={
    'phone':{'huawei':'ok','iphone':'good','chuizi':'bad'},
    'language':{
        'chinese':['xian','beijing'],
        'english':['usa','canada']
    }
}
patter = {_:{_:'ok'}} 

action=lambda a,b: {'key1':a,'key2':b}

print(match(my_dic,patter,action))

Running results ：

>>> python test.py
>>> {'key1': 'phone', 'key2': 'huawei'}

Above , We have matched the first and second layers of the dictionary Key value .

The example above , Our model must keep the dictionary structure intact .

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