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BaseStructure.py
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BaseStructure.py
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'''
This module is a component of web crawler framework that help collecting
ZHIHU & Douban data.
BaseStructure is an base class that to be customized for specific websites.
'''
class BaseStructure(object):
'''
This class creates basic html page structure analysis object.
This base class has the following basic functionalities:
+ Sets a list of data fields concerned in a certain webpage
'''
def __init__(self):
'''
Creates a data fields.
'''
raise NotImplementedError("Define __init__ for specific websites.")
def __repr__(self):
'''
Representation of the structure.
Returns:
a human readable list of data fields from the web page
'''
return dir(self)
def __str__(self):
'''
str method of the structure.
Returns same content as __repr__ yet called by print()
'''
return str(dir(self))
def set_fields(self):
'''
Set field rules to scape data from page using bs4.
To be defined in subclass.
'''
raise NotImplementedError("Define scaping rule for specific websites.")