Python module-Day8

1, using the module reason

To save memory

2, what is the module

• Python code or C language code
• Sort by function

3. Module classification

• Built-in modules, modules included in the Python interpreter
• Expansion module, installation required

Import Time forIinchRange (0,101,2): Time.sleep (0.1) Char_num= I//2#print How many ' * 'Per_str ='\r%s%%:%s\n'% (I,'*'* Char_num)ifi = = 100Else '\r%s%%:%s'% (I,'*'*char_num)Print(per_str,end="', flush=true)

Print progress bar

4. Built-in module

• Collections  :   Extended Database type

Import= collections.namedtuple ('tuples', ['a' ,'b','C'= t (  Wang', a)print(mytup)

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Results:
Tuples (a=24, b= ' Wang ', c=80)
Specify a key first, which is equivalent to defining a class;
Specifying value again is the equivalent of instantiating this class;

• Deque is a two-way list for efficient insert and delete operations, suitable for use in queues and stacks

   fromCollectionsImportDequeq= Deque (['a','b','C']) Q.append ('x') Q.appendleft ('y') Qdeque (['y','a','b','C','x'])

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Python module-Day8