Python Lesson Two

1. Variable

you can use it as long as it exists in memory. (Stack)

1. Ternary operations

name = value 1 if conditions established Else value 2

1. In-process

Binary octal decimal hexadecimal

Basis

All Things are objects, objects are created by classes

Type dir () help ()

Methods in a class

              __ Method __   private methods, there may be multiple ways of doing it

method has only one method of execution

Digital

ABS () CMP (x, y) coerce (× x) Divmod (y) x//y hash x**y

int (x) long (x) float (x)

STR (x) repr (x)

String

Str.capitalize () str.count (' abc ' [, Start[,end]])

Decode () encode ()

Str.endswith (Suffix[,start[,end]]) Str.startwith (Prefix[,start[,end])

Str.expandtabs ([tabsize]) to be 0 will be deleted when Tab

Str.find (Sub[,star[,end]) could not find the return -1 str.rfind ()

Str.index (Sub[,start[,end]) with the Find similar, but will not be found when the error Str.rindex ()

str1 = ' xxx {0},xxx{1} ' Str.format (' x ', ' y ') bit parameter  

str1 = ' xxx{par1},xxx{par2} ' Str.format (par1= ' xxx ', par2 = ' xxx ') Formal Parameters

str1 = ' xxx {0},xxx{1} ' Str.format (*list) Here's List is made up of parameter values

str1= ' xxx{par1},xxx{par2} ' Str.format (**dict) Here's Dict composition is { ' par1 ': xxx, ' par2 ': XXX }

Str.isalnum () Str.isalpha () Str.isdigit ()

str.islower () str.lower () Str.istitle () Str.title () Str.isupper () Str1.upper () str1.swapcase () uppercase and lowercase swaps

Str.isspace ()

' _ '. Join (str) in _ will be Str the element connection in

Str.center (Width[,fillchar=none]) str.ljust (Width[,fillchar=none]) str.rjust (Width[,fillchar=none])

str.partition (separator) à (Head,separator,tail)-- if the delimited character or string does not exist, it returns Str and two null characters str.rpartition ()

Str.replace (Old,new[,count]))

Str.split (Separator=none[,maxsplit=none]) str.rsplit (Separator=none[,maxsplit=none])

Str.splitlines (Keepends=false)

Str.strip ([chars]) Str.rstrip ([chars]) Str.lstrip ([chars])

str.translate (Trantable[,deletechars])) You need to make a conversion table, and if the conversion table does not exist, delete the string directly from the Deletechars

str.zfile (width) right-aligned, front padding 0

List

List.append (object) list.extend (iterable) Append put Object added to the list as an element, whether it's a string or a list or a dictionary, for Extend , if it is a string, it is broken into a word multibyte to the list, if it is a list, it is broken into a string to add, if it is a dictionary, the Key add it in .  

List.count (value)

List.index (Value[,start[,stop])

List.insert (Index,object)

list.pop ([index]) del List[index] Pop has a return value List.remove (value)

List.reverse () List.sort ()

meta-group

Tuple.count (value) Tuple.index (Value[,start[,stop])

dictionary

Dict.clear ()

dict.copy () Copy only one layer dict = copy.deepcopy (dict1) Deep Copy    -- need more practice

Dict.get (Key[,value=none]) Return , no return to the back. value , the default is None

Dict.fromkeys (List[,value=none]) with List in the worth. Key generates a new dictionary with values for the following value, default is None

Dict.has_key (Key)

Dict.items () Dict.iteritems ()

Dict.keys () dict.values ()

Dict.pop (K[,d=none]) Delete Key to be k value that returns the corresponding value value, if k does not exist, it returns to the back D, otherwise the error

del Dict[k] If it does not exist k , Error

Dict.popitem () remove a key-value pair in an unordered order

Dict.setdefault (k[,d]) equivalent Dict.get (k[,d]) if there is K , it returns the corresponding value, if not, increases Dict[k] = d, If not D , it is equal to None

dict.update (Dict1) with Dict1 to update Dict, If you do not have the same KEY , it increases, if there is, updates, the equivalent Merge

set set ()

Go to the dictionary operation

Submit & | Poor - Reverse Intersection ^

A.issubset (b) a is not b the subset

A.issuperset (b) a is not b the parent set

A.pop () A.remove () a.update (b)

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Python Lesson Two