what built in function

This function is the length of the returned object s , the so-called length refers to the number of data items in the container class, such as strings, tuples, lists, dictionaries, and so on. Example:#len () s = ' 123456789 ' soft = ' software '

Min (arg1, arg2, *args[, key])This function is the iteration object iterable to compare, find the minimum value to return. When the key parameter is not empty, it is judged by the function object of key. Example:#min () Array1 = Range (Ten) Array2 =

1. Eval functionThe eval () function is used to execute a string expression and return the value of the expression.Eval(expression[, globals[, locals]]) Parameters Expression--expressions. Globals--variable scope, global namespace,

s= "6*8"A=eval (s)print (a)#filter与mapa=[10,20,30,40]New_list=map (lambda x:x+10,a)b=list (new_list)print (b)def x (b):c=b+10return CC=map (x,a)d=list (c)print (d)def bb (x):if (x>=30):return TrueElse:return FalseC=filter (bb,a)Print (list

This morning to learn isinstance, a little understanding, on the record (do not know right)Syntax: Isinstance (Object,type)function: to determine whether an object is a known type. Its first argument (object) is the second parameter (type) is the

1 descriptionThe sum () method sums the series.2 syntaxSum (iterable[, start])Iterable: An object, such as a list, that can be iterated.Start: Specifies the parameter to add, or 0 if the value is not set.3 ExamplePrint (SUM ([0,1,2])) # No

1 descriptionTo execute a string as a statementexec () executes python statements stored in a string or file, and exec () can execute more complex Python code than eval () .2 syntax exec(object[, globals[, locals])Object: A required parameter that

English documents:setattr(object, name, value)This is the counterpart of getattr() . The arguments is an object, a string and an arbitrary value. The string may be name an existing attribute or a new attribute. The function assigns the value to the

English documents: getattr (object, name[, default]) Return the value of the named attribute of object. name must is a string. The If the string is the name of the one of the object ' s

After working with a girlfriend to learn Python3, code is she knocked, a little spicy eyes, only for reference.1. Title: Enter "name", output "Hello, name"For instructions on installing and opening the Python shell, refer to this:

This function is used to delete an object's properties, such as a property added in the function setattr () , which can be removed using this function. Argument object is an object, the parameter name is a string, but the string must be an object's

This function is used to compile a string of source code, the result can be generated bytecode or AST(like syntax tree), bytecode can be executed using function exec () , and AST can use eval () to continue compiling. The parameter source is the

Returns Trueif all the elements of an object that can be iterated are all non-empty (or an empty iteration object). This function is mainly used to determine whether the list, tuples, dictionaries and other objects have empty elements, such as a

This function, like the repr () function, returns a printable representation of an object string. When a non- ASCII Code is encountered, it is output \x,\u , or \u characters . the repr () in Python version 2 is the equivalent function.

This is the content of the December plan, beginning in January 2018 ~If there is any mistake, please ask for it ~Letter Manipulationstr.capitalize()Returns a copy of the string with the first character capitalized and the remaining characters

Workaround:1. Modify the project. BuildPath file # 新增一句 kind="con" #如果哪部分少了, just add the modifications to which part, when I was in Zend 10.0, 新增Then in the Zend Project home directory blank Place refresh, solved, not the following steps. If you

Ucfirst ($STR)strconverts the first character (if the first character is a letter) to an uppercase letter, and returns the string.Source is located in Ext/standard/string.c1 /*{{{ php_ucfirst2 Uppercase the first character of the word in a native

# 。 /usr/bin/env python #-*-Coding:utf-8-*- """ Each py file has its own built-in function Print (VARs ()) to view If this module is a directory when you import the module, you need to create a __init__ file in it. """ #print (VARs ()) #常用的函数内置函数

Because there's not a lot of articles on the web about this framework, and it is not very good for Chinese support, manuals and everything is in English, although not many, but given that some novice may not have the time and energy to read the

--Absolute valueSelect ABS ( -100) from dual;--Take surplusSelect mod (8,3) from dual;--Rounding, the smallest integer greater than the number (upper value)Select Ceil (12.0) from dual;Select Ceil (12.5) from dual;--rounding, which is less than the