Day10-python Basic data types

Day10-python basic Data Type 1.1 Python 3.5.2 Installation

1,:https://www.python.org/ftp/python/3.5.2/python-3.5.2-amd64.exe

2, the installation process is done directly next.

3, add environment variable; paste the Python installation path into the system variable---path

1.2 Pycharm 5.0.3 Professional Edition installation

1,:http://down10.zol.com.cn/bianchengtools/pycharm503.zip

2, crack the installation process, first adjust the system time to 2038, and then install Pycharm Direct Next, choose to apply 30 days to use, complete the installation, and finally adjust the system time.

3, configure the Python interpreter: Location path: The project is stored interpreter path: Python.exe installation location, create completed.

1.3 operator

The result is a value:

1, arithmetic arithmetic

2, assignment operation

The result is a Boolean value:

3, Comparison operation

4, logical operation

5, Member arithmetic

Inch	Returns ture if a value is found in the specified sequence, otherwise fasle	x in the y sequence; if x returns ture in the Y sequence
Not in	Returns ture if no value is found in the specified sequence, otherwise fasle	X is not in the y sequence; if x does not return ture in the y sequence

1.4 Basic data types

1, Digital int

Int

Function: Converts a string to a number A = "123" b = Int (a) Print (type (b), B) Output result: <class ' int ' > 123

Bit_lenght

Function: Gets the number of bits in the binary A = 11 v = a.bit_length () Print (v) Output results: 4

2, String str

Capitalize

Function: Capitalize the first character S1 = "Liyang" v = s1.capitalize () Print (v) Output Result: Liyang

Casefold && Lower

Function: Turn all the characters into lowercase, casefold more S1 = "Liyang" V1 = S1.casefold () Print (v1) Output Result: Liyang && V2 = S1.lower () Print (v2) Output Result: Liyang

Center

Def center (self, width, fillchar=none) Function: Set the width, and center the content; 20-generation means total length; * Blank unknown padding, one character, optional S1 = "Liyang" V3 = S1.center (20, "Yang") Print (v3) Output result: Yangyangyangyang Liyang Yangyangyangyang

Count

Function: To find the number of occurrences of a subsequence in a string; 5 means to start with the first few characters. S1 = "Liyangliyang" v = s1.count (' li ', 5) Print (v) Output results: 1

EndsWith

def endswith (self, suffix, start=none, end=none): function: to what end; S1 = "Liyang" V1 = s1.endswith (' y ') V2 = S1.startswith (' l ') Print (v1) Output Result: False Print (v2) Output Result: True

Find

def find (self, sub, Start=none, End=none): Function: From the beginning to find, find the first one, get its position; location range > or >= S1 = "Liyangliyang" v = s1.find (' ya ', 7,11) Print (v) Output results: 8

Index

def index (self, sub, Start=none, End=none): Function: Can't find error, can ignore, direct use Find S1 = "Liyangliyang" v = s1.index (' 8 ') Print (v) Output Result: Error

Format

def format (*args, **kwargs): Function: Replaces a placeholder in a string with the specified value S1 = ' I am {name} ' Print (S1) v = s1.format (name= ' Liyang ') Print (v) Output result: I am {name} Output result: I am Liyang && S2 = ' I am {0},age{1} ' Print (s2) v = S2.format (' Liyang ', 28) Print (v) Output result: I am {0},age{1} Output result: I am liyang,age28

Format_map

Function: Format, the value of the descendant {"name": ' Liyang ', "a": 28} S1 = ' I am {name}, age {a} ' v = s1.format_map ({"Name": ' Liyang ', "a": 28}) Print (v) Output result: I am Liyang, age 28

Isalnum

Function: Determine if the string contains only letters and numbers S1 = "liyang111" v = s1.isalnum () Print (v) Output Result: True

Isalpha

Function: Determines whether the character contains only letters, returns true otherwise returns false S1 = "Liyang" v = S1.isalpha () Print (v) Output Result: True

Isdecimal

function: If the word breaker contains only numbers, return true otherwise false S1 = "23423" v = s1.isdecimal () Print (v) Output Result: True

IsDigit

function: If the word breaker contains only numbers, return true otherwise false S1 = "23423" v = s1.isdigit () Print (v) Output Result: True

Isidentifier

Function: Detects if a string is the beginning of a letter S1 = "werwer234" v = s1.isidentifier () Print (v) Output Result: True

Day10-python Basic data types