Python Basic Knowledge Code example practice

1---2 * * 32 3---True andTrue4TrueorFalse5     notTrue6 7---python isa Smart language85/2 = = 5.0/2.0//False95 * 2 = = 5.0 * 2.0//TrueTen  One---python isstore values instead of expression A  ----Str ->>> 3 *'a' the 'AAA' -  ->>> 3 *'AB' - Ababab +  ->>>'a'+'a' + AA A  at>>>'a'+ STR (3) - A3 -  - function -1. Len () -2. Extract in2.1'ABC'[0] >>>'a' -              'ABC'[-1] >>>'C' to2.2'string'[Beg:end] [beg,end) +              'ABC'[1:3] >>>'BC'  -2.3'string'[Beg:end:step] the  *---raw_input () $ Panax Notoginseng---# -  the--- +x = Int (Raw_input ('Enter an integer')) A ifx%2 = =0: the     Print("') +     Print('even') - Else: $     Print("') $     Print('ODD') - Print('Done with conditional') -  the---range (n) [0,n-1] -Range (n,m) [n,m-1]Wuyi  the--- forLetterinch 'Hola': -     PrintLetter

Color Description:

This is the difference between Python and C + +

This is the difference between Python and Matlab.

This is a puzzle.

This is a question.

1. The difference between print mystring and >>>mystring

>>>print mystring is called STR ()

>>>mystring is called repr ()

2. _ Represents the value of the previous expression.

The difference between an expression and a statement

An expression can be understood as an expression; is an illegal statement in C + +

Statements can be interpreted as statements; is a valid statement in C + +

3.% output

>>>print'%s is number%d! ' % ('Python', 1 is

4. Enter

5. Document String

The call is much like Javadoc through module.__doc__ or class.__doc__ or function.__doc__.

6. Priority Level

* * > + +-*/

7.3 < 4 < 5: = 3 < 4 and 4 < 58. Extremely small number of operators

+ - * / %  **

No--must use-= 1

Written questions:

1.--2//2-( -2) ^_^

2.2--//error

9. Shaping the scope of the representation >> int in C + +10. Plural is 1+2j not 1+2i11.List can be modified, [], type can be different

12.TupleNot to be modified, (),types can be different

Dict.

14.While

Because the while behind can not be used () so need: Explain the conditions have been finished

. Print line wrap print a with space16. List Resolution

17. Read in the file

18. Function def

--------------------------------------------------------------------------------------------------

1. Special characters

# Notes

\ nthe line break

\ continue to the next line of "'" or () [] {} Do not show the write \

; Connect 2 words

: Sub-opening and body

2. The difference between single and triple quotation marks

3. Assignment is a reference, the assignment does not return a return value

4. Variable assignment???

5. Assignment of multivariate assignment tuple values

6. Special variables

_xxx do not import with ' from module import '

_xxx_ System Definition Name

Private variable name of the _xxx class

7. layout???

Attention:

1. After import, functions and classes are defined.

2. The function called is __name__ = ' __main__ '

Main function is __name__ = module name

8. Counting

Increase:

1. Object creation

2. References

3. As a parameter

4. Become an element of a container

Reduce:

1. Leave {}

2.del y

3. Remove (x)

4.del List

Python Basic Knowledge Code example practice