Python Practice path __ Data type

There are six standard data types in the Python3:

• Number (numeric)
• String (String)
• List (lists)
• Tuple (tuple)
• Dictionary (dictionary)
• Set (SET)

In Python, the most basic data structure is the sequence (sequence). Each element of the sequence is assigned an ordinal-that is, the index (the position of the element), the first index is 0, the second is 1, and so on.

• Number (numeric)

Numeric type:

Type	Describe	Syntax examples
int (integral type)	Number without fractional part (only one integer type int (Long integer) in Python3, without long in Python2)	42
Float (float type)	A number with a small number of parts	42.5, 42.5e-2
Complex (compound type)	Real numbers (integers or floating-point numbers) and imaginary and	38+42j,42j
BOOL (Boolean type)	There is no bool type in Python2, which is represented by the number 0 false,1 for true.

Numeric operators:

Operator	Describe
+	Addition
-	Subtraction
*	Multiplication
/	Division (surplus number)
//	Division (divisible, no number)
%	Take surplus
**	Power (exponentiation)

Example:

1>>> 7 + 3# addition2103>>> 7-3# Subtraction445>>> 7 * 3# multiplication621st7>>> 2/4# Division, get a floating-point number80.59>>> 2//4# Division, get an integerTen 0 One>>> 7% 3# take the remainder A1 ->>> 7 * * 3# Power (exponentiation) -343

• String strings

Strings are a string of characters that consist of numbers, letters, and underscores.

The strings in Python are enclosed in single quotation marks (') or double quotation marks (""), and Python uses a backslash (\) to escape characters when special characters are required.

Escape characters:

escape character	description
\	(at end of line)
\ \	backslash symbol
\ '	single quotation marks
\ "	double quotes
\a	ring
\b	backspace (Backspace)
\e	escape
\000	Terminator, the string after \000 all ignore
\ n	line break
\v	portrait tab
\ t	horizontal tab (tab)
\ r	carriage return
\f	page Break
\oyy	octal number, yy for character, for example: \o12 for line break
\xyy	hexadecimal number, yy for character, for example: \x0a for line break
\other	Other characters output in normal format

String operators

Example a = "Hello", B = "Python"

Operator	Describe	Example
+	String connection	>>> A + b'hellopython'
*	Repeating output string	>>> A * 2'hellohello'
[]	Getting characters in a string by index	>>> a[1]'e'
[:]	Intercept part of a string	>>> a[1:4]'ell'
Inch	Member operator-Returns TRUE if the string contains the given character	" H " inch atrue
Not in	Non-member operator-returns TRUE if the string does not contain the given character	" a " not inch atrue
R/r	Raw string
%	format string

String formatting

Python supports the output of formatted strings. Although this may use a very complex expression, the most basic usage is to insert a value into a string that has the string format of%s.

Python Practice path __ Data type