python dictionary of dictionaries

(Name.lower ()) #把所有的小写字母都变成大写#NA = ' select * from 'Print (Name.startswith (' select ')) #判断字符串是以XX开始的#na = ' 1.jpg 'Print (Name.endswith ('. jpg ')) #判断字符串是以XX结尾的#f = ' {name} welcome 'Print (F.format (name= ' YBQ ')) #格式化#f = ' {name} welcome 'D = {' name ': ' YBQ '}Print (F.format_map (d)) #字典形式格式化#Print (Name.replace (' t ', ' d ')) #字符串替换, the first one is old, the second is the new one.Print (Name.isdigit ()) #是否是数字Print (' 123 '. IsDigit ()) #是否是数字#Print (Name.isalnum ()) #是否包含数字或字母Prin

How to Use the python dictionary for multi-key and repeated key values (detailed description), python dictionary Use a dictionary in Python in the following format: dict={ key1:value1 , key2;value2 ...} The usage format for actual

Check out the Python official documentation version 3.6 prior to learning about the following knowledge.1, Range (start,stop,step) function. Start defaults to 0,step to take a number every few steps.List[range (5)]=[0,1,2,3,4]The integer within the generated range. List[range (1,5)]=[1,2,3,4]List[range (1,5,2)]=[1,3]2, Randint (b) generates a random integer between a B (including a B). A=randint (3,6) a=3|4|5|63. generate a list with a length of 10, w

Functions used in the classic dictionaryDict: Create a dictionary through a sequence pair such as other ing (such as other dictionaries) or (Key, value. Of course, dict is not very definite as a function. It is essentially a type. Like list. Copy codeThe Code is as follows:Items = [('name', 'zhang '), ('age', 42)]D = dict (items)D ['name'] Len (d): number of returned itemsD [k]: The value above the return k

1, the basic derivation type (1) List derivation is one of the most popular features of Python, and it can be used to construct new lists very efficiently: just a simple piece of code that filters the family elements and distorts the resulting elements with the following basic grammatical structure: [Exp for Val in collection if condition] #列表推导式 The code above corresponds to the following loop: result = [] ...: For Val in collection: ...:

Python nested dictionary comparison value and value implementation example, python nested dictionary example Preface This article provides examples to show you how to compare the values and values of the python nested dictionary a

This article illustrates how Python simply traverses the dictionary and deletes elements. Share to everyone for your reference, specific as follows: There must be a problem with this approach: D = {' A ': 1, ' B ': 2, ' C ': 3} for key in D: D.pop (Key) will report this error:runtimeerror:dictionary changed size during iteration This way Python2 feasible, Python3 or reported the above error.

3.4.6 Items and Iteritems Description: Items returns a key-value pair in a dictionary as a list, and Iteritems returns a key-value pair with an iterator object (no longer supported in Python3); Example:1: >>> x 2: {' name ': ' Bill '} 3: >>> x.items () 4: dict_items ([' Name ', ' Bill ')] 5: 6: #python3中不再包含iteritems 7: >>> x.iteritems () 8:traceback (most recent Call last): 9:file "10:x.iteritems ()11:attributeerror: ' d ICT ' object h

Tuple a = (1,2,3,[1,2,3) tuples cannot modify the list of available nested lists such as (*. A]) can be modified generally not usedList A = [+/-A]The maximum feature of set set a = {one-way} will automatically go from, so he is not ordered, nor does it support slicing,The dictionary dict is basically the same as the set, which is the form of the Key:value key-value pair A = {"A": 1, "B": 2} is a JSON-formatted data pairTuple lists, the conversion of c

listIndex () #查看某一元素的索引号, no error foundExtend () #扩展列表L.extend ([i]) #将列表 [All-in-one] append to the list L, merged into a list,Remove () #删除元素 by default (that is, delete from the left)L.remove (' A2 ') #指定元素删除Sort () #排序, from small to large, no return valueReverse () #反转操作, no comparison [1,2,3,4]>>[4,3,2,1]Two, the meta-groupDefinition: Similar to a list, except [] Change to ()Characteristics:1. Can hold multiple values, the elements of a tuple can be any data type2. Immutable3. Define the

The data is displayed as:rows=[{' date ': ' 2018-09-04 ', ' Test 1 ': ' 50.00 ', ' Test 2 ': ' 100% '}, {' Date ': ' 2018-09-05 ', ' Test 1 ': ' 100% ', ' Test 2 ': ' No Execute '}, {' Date ': ' 2018-09-06 ', ' Test 1 ': ' 100% ', ' Test 2 ': ' 100% '}, {' Date ': ' 2018-08-31 ', ' Test 1 ': ' No execution ', ' Test 2 ': ' No Execution '}, {' Date ': ' 2018-09-01 ', ' Test 1 ': ' No execution ', ' Test 2 ': ' No Execute '}, {' Date ': ' 2018-09-02 ', ' Test 1 ': ' No execution ', ' Test 2 ': ' N

#!/usr/bin/python fromTimeImportClockl = [(x,x) forXinchXrange (10000000)] D = dict (l) t0 = Clock ()# Method One forIinchD:n = D[I]T1 = Clock ()# Method Two: Slowest forKvinchD.items (): n = vt2 = Clock ()# Method Three: Fastest, recommended method forKvinchD.iteritems (): n = v t3 = Clock ()# method Four forKvinchZip (D.iterkeys (), D.itervalues ()): n = v T4 = Clock ()PrintT1-t0, T2-t1, T3-t2, T4-T3The above code executes five times, the results ar

want a particular order, then you should sort them before using them. Instance: #coding = UTF-8 #author: Rxs002dict1 = {' Zhang ': ' hellos ', ' Wang ': ' Wangbaoqiang ', ' li ': ' Bingbing ', ' Zhao ': ' Vicki '} #字典的操作, add, delete, print dict1[' Huang '] = ' Huang Jiaju ' del dict1[' Zhao ']for firstname,name in Dict1.item (): Print Firstname,name Execution Result: Li Bingbing Wang Wangbaoqiang Huang Huang Jiaju Zhang Hellos Summarize This is about