Re-reading LPTHW-Lesson1-14, lpthw. web

Re-reading LPTHW-Lesson1-14, lpthw. web

1. For python print, you can use "Hello World" or "Hello World" or "" Hello World """

2. to print a line, you can add a comma (,) after the line, that is:

print "There is only one line",print "even it looks like two lines."

3. To print multiple lines, use three quotation marks """

print “”“This is the first lineThis is the second lineThis is the last line.”“” 

 

4. If you want to enter Chinese characters, add the following code to the first line:

#-*-Coding: UTF-8-*-print u "normal Chinese test"

5. The raw_input function prompts Chinese characters and can operate as follows:

#-*-Coding: UTF-8-*-name = raw_input (" ". decode ('utf-8 '). encode ('gbk') print "% s hello! "% Name

6. # used to indicate annotation # The part after the annotation is automatically ignored by python

7. ① 3/2 = 1 in python operations; 3.0/2 = 1.5 pay attention to floating point numbers

② <= Indicates ≤> = indicates ≥

③ % Indicates that the remainder operation can be used to determine parity

④ ** Multiplication and exponent operations

⑤ Adding spaces on both sides of the operator can improve code readability

8. Pay attention to the selection of variable names. During variable naming, underlines can be used as hypothetical spaces.

9. "=" is used to assign values. "=" is used to determine whether the left and right sides are equal.

10.% indicates the format of the formatted string. It is a reserved position for the true value. It places the variable in the corresponding position and controls the display format, for example:

print "I'm %s, I am %d year old." %("Jer",23)

The format string type is as follows:

 

% S	String
% R	String
% C	Convert to ASCII code
% B	Unsigned binary integer
% D	Signed decimal number
% O	Unsigned octal number
% X	Unsigned hexadecimal number
% E or % E	Floating Point Number, represented by scientific notation
% F	Floating Point Number
%	String %

11. \ indicate escape characters in Python

① Enter double quotation marks in a single quotation mark string and escape them \

②

Escape characters	Description
\ (At the end of a row)	Line feed
\\	Backslash
\'	Single quotes
\"	Double quotation marks
\	Ring tones
\ B	Backspace)
\ E	Escape
\ 000	Null
\ N	Line feed
\ V	Vertical Tab
\ T	Horizontal Tab
\ R	Enter
\ F	Form feed
\ Oyy	A string of 8 characters in yy format. For example, \ o12 indicates a line break.
\ Xyy	The character in the decimal number yy. For example, \ x0a indicates a line break.
\ Other	Other characters are output in normal format

12. For pydoc, you can view the introduction to internal function creation in the Python document.

Input in Windows: python-m pydoc raw_input # view raw_input Introduction

Input in Linux: pydoc raw_input # view raw_input function Introduction