python small examples
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| Small example | Link | Label | Version | difficulty |
|---|---|---|---|---|
| 1 | Common arithmetic operations | Operation | v1 | |
| 2 | Implement relu | max | V4.0 | ️️ |
| 3 | Base conversion | bin,oct,hex | V4.0 | ️️ |
| 4 | Convert integers to ASCII | chr,ord | V1.0 | ️️ |
| 5 | Check if elements are all true | all | V2.0 | ️️️ |
| 6 | at least one is true check | any | V2.0 | ️️️ |
| 7 | Determine whether it is true or false | bool | V2.0 | ️️️ |
| 8 | Create plurals | complex | V1.0 | ️️️ |
| 9 | Get quotient and remainder | divmod | V1.0 | ️️ |
| 10 | Convert to floating point type | float | V1.0 | ️️ |
| 11 | Convert to integer | int | V1.0 | ️ |
| 12 | Power | pow | V1.0 | ️ |
| 13 | rounding | round | V1.0 | ️ |
| 14 | chained comparison | compare | V1.0 | ️️ |
| 15 | String to byte | bytes,utf-8 | V1.0 | ️️ |
| 16 | Convert any object to string | str | V1.0 | ️️ |
| 17 | Execute the code represented by the string | compile | V1.0 | ️️️ |
| 18 | Calculation expression | eval | V1.0 | ️️️️ |
| 19 | String formatting | format | V1.0 | ️️️️ |
| 20 | Swap two elements | pack,unpack | V1.0 | ️️ |
| twenty one | Convert to dictionary | dict | V1.0 | ️️ |
| twenty two | freeze collection | frozenset | V1.0 | ️️ |
| twenty three | Convert to collection type | set | V1.0 | ️️ |
| twenty four | Convert tuple | tuple | V1.0 | ️️ |
| 25 | Check the number of bytes occupied by the variable | getsizeof | V1.0 | ️️️ |
| 26 | Tuple containing a single element | tuple | V1.0 | ️ |
| 27 | Pitfalls of list deletion | list | V1.0 | ️ |
| 28 | The Pitfalls of Quick Copying of Lists | list | V1.0 | ️ |
| 29 | Find the first 3 largest or smallest numbers in a list | list heapq | v1.0 | ️ |
| 30 | string resident | str | V1.0 | ️ |
| 31 | Create empty collection error | set | V1.0 | ️ |
| 32 | Fully understand for | for | V1.0 | ️ |
| 33 | Know when to execute | generator | V1.0 | ️ |
| Small example | Link | Label | Version | difficulty |
|---|---|---|---|---|
| 1 | Operation function object | operator | V2.0 | ️️️️ |
| 2 | Create a range sequence | range | V1.0 | ️️ |
| 3 | Generate reverse sequence | range | V1.0 | ️️ |
| 4 | Ready-to-use sorting function | sorted | V1.0 | ️️️ |
| 5 | summation function | sum | V1.0 | ️️ |
| 6 | Examples of using five types of parameters of functions | variable parameter | V2.0 | ️️️️ |
| 7 | Use the slice object | slice | V2.0 | ️️️️️ |
| 8 | lambda function | lambda | V3.0 | ️️️️ |
| 9 | enumeration object | enumerate | V1.0 | ️️️ |
| 10 | filter filter | filter | V1.5 | ️️️ |
| 11 | Return object hash value | hash | V1.0 | ️️ |
| 12 | tuple with name | namedtuple | V1.0 | ️️️ |
| 13 | One line of code to reverse a list | reverse | V1.0 | ️️ |
| 14 | Two ways to reverse a string | reversed | V1.0 | ️️ |
| 15 | join concatenates strings | join | V1.0 | ️️ |
| 16 | String length in bytes | encode | V1.0 | ️️ |
| 17 | groupby single field grouping | itertools, groupby, lambda | V1.0 | ️️️ |
| 18 | groupby multi-field grouping | itemgetter,itertools,groupby | V1.0 | ️️️️ |
| 19 | itemgetter and key functions | operator,itemgetter,itertools | V1.0 | ️️️️️ |
| 20 | The sum function calculates and aggregates at the same time | sum,generator | V1.0 | ️️️️️ |
| twenty one | Default parameters are set to empty | function | V1.0 | ️ |
| twenty two | Pitfalls in using various parameters | function parameter | V1.0 | ️ |
| twenty three | The pitfall of lambda free parameters | lambda | V1.0 | ️ |
| twenty four | Use heap ascending list | sort heapq | v1.0 | ️ |
| Small example | Link | Label | Version | difficulty |
|---|---|---|---|---|
| 1 | root of all objects | object | V1.0 | ️ |
| 2 | Is the object callable? | callable | V2.5 | ️️️️ |
| 3 | ascii display object | __repr__ | V2.5 | ️️️ |
| 4 | class method | classmethod | V1.5 | ️️️ |
| 5 | Dynamically delete attributes | delattr,hasattr | V1.5 | ️️ |
| 6 | View all methods of an object with one click | dir | V1.5 | ️️ |
| 7 | Dynamically obtain object properties | getattr | V1.5 | ️️ |
| 8 | Whether the object has a certain attribute | hasattr | V1.5 | ️️️ |
| 9 | Object house number | ID | V1.0 | ️ |
| 10 | Instance and object relationship judgment | isinstance | V1.5 | ️️️ |
| 11 | issubclass parent-child relationship identification | issubclass | V1.5 | ️️️ |
| 12 | Two ways to create properties | property | V2.5 | ️️️️️ |
| 13 | View object types | type | V1.0 | ️ |
| 14 | Introduction to using metaclasses | type, __class__ | V2.0 | ️️️️️ |
| 15 | Immutable objects of the same value | mutable | V1.0 | ️ |
| 16 | Object destruction order | OOP del | V1.0 | ️ |
| 17 | Do subclasses inherit static methods from parent classes? | staticmethod | V1.0 | ️ |
| Small example | Link | Label | Version | difficulty |
|---|---|---|---|---|
| 1 | The role of the character r in regular expressions | re, r | V3.0 | ️️️ |
| 2 | Regular atomic operations | re | V3.0 | ️️️ |
| 3 | Escapes in regular expressions | re, | V3.0 | ️️️ |
| 4 | The most common regular search | re,findall | V3.0 | ️️️ |
| 5 | Find using universal characters | re,s,w,d | V3.0 | ️️️ |
| 6 | Search using metacharacters | re,+,* | V3.0 | ️️️ |
| 7 | capture substring | () | V3.0 | ️️️️ |
| 8 | Greedy capture and non-greedy capture | re | V1.0 | ️️️️ |
| 9 | Use regular rules to do password security checks | re | V1.0 | ️️️️️ |
| 10 | Crawl Baidu homepage title | re | V1.0 | ️️️️ |
| 11 | Batch conversion to camel case format (Camel) | re | V1.0 | ️️️️️ |
| 12 | Use regular expression to determine whether it is a positive floating point number | str,re,float | V1.0 | ️️️️️ |
| 13 | Use regular expressions to extract positive integers and floating point numbers greater than 0 | re findall | v2 | ️ |
| Small example | Link | Label | Version | difficulty |
|---|---|---|---|---|
| 1 | A simple understanding of decorators | decorator | V1.0 | ️️️ |
| 2 | Decorator for testing function runtime | decorator | V1.0 | ️️️️ |
| 3 | Count exception decorator | decorator,nonlocal | V1.5 | ️️️️ |
| 4 | Custom descending iterator | Iterator | V3.0 | ️️️️ |
| 5 | Create iterator | iter, __iter__ | V1.5 | ️️️ |
| 6 | Reverse iterator reversed | reversed | V1.0 | ️️ |
| 7 | zip iterator | zip | V1.5 | ️️️ |
| 8 | list grouping (generator version) | yield,generator | V1.0 | ️️️ |
| 9 | Full list expansion (generator version) | list,yield,generator | V1.0 | ️️️ |
| 10 | chain small containers into large containers | itertools,chain | V1.0 | ️️️️️ |
| 11 | product use case | product | V1.0 | ️️️️️ |
| 12 | The first n terms of the Fibonacci sequence | yield, range | V1.0 | ️️️ |
| Small example | Link | Label | Version | difficulty |
|---|---|---|---|---|
| 1 | Turtle draws the Olympic rings | turtle | V1.0 | ️️️ |
| 2 | turtle draws snowflakes in the sky | turtle | V1.0 | ️️️ |
| 3 | Python word cloud chart | WordCloud | V1.0 | ️️ |
| 4 | Plotly bar charts and line charts | plotly | V1.0 | ️ |
| 5 | seaborn heat map | seaborn | V1.0 | ️ |
| 6 | Pyecharts dashboard | pyecharts | V1.0 | ️ |
| 7 | Pyecharts Funnel Chart | pyecharts | V1.0 | ️ |
| 8 | Pyecharts Water Polo Chart | pyecharts | V1.0 | ️ |
| 9 | Pyecharts Pie Chart | pyecharts | V1.0 | ️ |
| 10 | Pyecharts polar plot | pyecharts | V1.0 | ️ |
| 11 | Pyecharts word cloud chart | pyecharts | V1.0 | ️ |
| 12 | Pyecharts heatmap | pyecharts | V1.0 | ️ |
| 13 | matplotlib draws animations | matplotlib | V1.0 | ️ |
| 14 | seaborn pairplot diagram | seaborn | V1.0 | ️ |
| 15 | pyecharts fails to pass in Numpy data drawing | numpy pyecharts | V1.0 | ️ |
| 16 | Image processing package pillow | pillow | V1.0 | ️ |
| Small example | Link | Label | Version | difficulty |
|---|---|---|---|---|
| 1 | Data analysis artifact: deepnote | deepnote | v1.0 | ️ |
| 2 | NumPy pad filling method | NumPy pad | V1.0 | ️ |
| 3 | Create a diagonal matrix with lower diagonals 1, 2, 3, and 4 | NumPy diag | V1.0 | ️ |
| 4 | cut data binning | Pandas cut | v1.0 | ️ |
| 5 | Discard null values and fill null values | Pandas dropna fillna | v1.0 | ️ |
| 6 | The apply method removes special characters | pandas apply | v1.0 | ️ |
| 7 | Use map to perform feature engineering on columns | pandas map | v1.0 | ️ |
| 8 | Convert category column to numerical value | pandas category | v1.0 | ️ |
| 9 | rank ranking | pandasrank | v1.0 | ️ |
| 10 | Complete data downsampling and adjust the step size from hours to days | pandas resample | v1.0 | ️ |
| 11 | How to quickly generate time series data with Pandas | pandasutil | v1.0 | ️ |
| 12 | How to quickly find the number of null values in all columns of a DataFrame | pandas isnull sum | v1.0 | ️ |
| 13 | Reorder columns of DataFrame | pandas dataframe | v1.0 | ️ |
| 14 | Use count to count the number of occurrences of a term | pandas count | v1.0 | ️ |
| 15 | split finds the minute difference between hours and minutes (HH:mm) | pandas split | v1.0 | ️ |
| 16 | melt pivot data tips | pandasmelt | v1.0 | ️ |
| 17 | pivot perspective tips | pandasmelt | v1.0 | ️ |
| 18 | p randomly reads K lines of the file and generates N | pandas sample | v1.0 | ️ |
| 19 | Formatting time column in Pandas | pandas apply | v1.0 | ️ |
| Small example | Link | Label | Version | difficulty |
|---|---|---|---|---|
| 1 | help one-click help | help | V1.0 | ️ |
| 2 | Get user input | input | V1.0 | ️ |
| 3 | File reading and writing and mode value table | open,read,write,with,mode | V2.0 | ️️️ |
| 4 | Examples of using operator | operator | V1.0 | ️️️️ |
| 5 | Transfer json object | json | V2.0 | ️️️️️ |
| 6 | Get file extension | os,splitext | V1.0 | ️️ |
| 7 | Get the file name in the path | os,split | V1.0 | ️️ |
| 8 | Modify file suffixes in batches | argparse,listdir | V1.0 | ️️️️ |
| 9 | Convert xls to xlsx in batches | os,listdir,splitext | V1.0 | ️️️️ |
| 10 | Get the file with the specified suffix name | os,listdir,splitext | V1.0 | ️️️️ |
| 11 | Batch compress files | zipfile | V1.0 | ️️️️ |
| 12 | 32-bit encryption | hashlib | V1.0 | ️️️️ |
| 13 | year calendar chart | calendar | V1.0 | ️️ |
| 14 | Determine whether it is a leap year | calendar | V1.0 | ️️️ |
| 15 | Determine how many days there are in the month | calendar,datetime | V1.0 | ️️️ |
| 16 | first day of month | datetime | V1.0 | ️️ |
| 17 | last day of month | calendar,datetime | V1.0 | ️️ |
| 18 | Get current time | time,datetime | V1.0 | ️️ |
| 19 | Convert character time to time | time,datetime | V1.0 | ️️ |
| 20 | time to character time | time,datetime | V1.0 | ️️ |
| twenty one | 1~n days after getting a certain day | Calendar,monthrange | V4.0 | ️️️ |
| twenty two | Start main thread by default | threading | V1.0 | ️️ |
| twenty three | Create thread | threading | V1.0 | ️️ |
| twenty four | Alternately obtain CPU time slices | threading | V1.0 | ️️️ |
| 25 | Multiple threads grab the same variable | threading | V1.0 | ️️️ |
| 26 | Problems caused by multi-thread variable competition | threading | V1.0 | ️️️ |
| 27 | multithread lock | threading,lock | V1.0 | ️️️ |
| 28 | Time to array and common formats | time,datetime,format | V1.0 | ️️️ |
| 29 | nonlocal is used in inline functions | nonlocal | V2.0 | ️️️️️ |
| 30 | global declares global variables | global | V2.0 | ️️️️️ |
| 31 | The pitfall of unbound shared variables | global | V1.0 | ️ |
| 32 | Optimize code exception output package | debugger | V1.0 | ️ |
| 33 | One line of code to find the encoding | chardet | V1.0 | ️ |
| 34 | Create SQLite connection | SQLite | v1.0 | ️ |
| 35 | json object to python object | python json | v1.0 | ️ |
| 36 | Convert python object to json object | python json | v1.0 | ️ |
| 37 | One line of code speeds up pip installation 100 times | pip install | v1.0 | ️ |
| Small example | Link | Label | Version | difficulty |
|---|---|---|---|---|
| 1 | Implement a calculator without else and if | operator | V1.0 | ️️️ |
| 2 | Go for the average | list,sort,round | V1.0 | ️️️️ |
| 3 | Print 99 multiplication table | for,range,format | V1.0 | ️️️ |
| 4 | Recursive version of flatten function | recursion,list,isinstance | V1.0 | ️️️️ |
| 5 | The list is divided into n equal parts | list,ceil | V1.0 | ️️️ |
| 6 | compressed list | list,filter | V1.0 | ️️️️ |
| 7 | Ask for a longer list | max, lambda | V1.0 | ️️️️️ |
| 8 | Find the mode of a list | max, lambda, count | V1.0 | ️️️️ |
| 9 | Maximum value of all multiple lists | max, lambda | V1.0 | ️️️️ |
| 10 | List check for duplicates | set | V1.0 | ️️️ |
| 11 | Arithmetic sequence of floating point numbers | range, float | V1.0 | ️️️️ |
| 12 | Group by condition | lambda | V1.0 | ️️️️ |
| 13 | map implements vector operations | map,lambda | V1.0 | ️️️ |
| 14 | Dictionary with the largest value | max, lambda | V1.0 | ️️️️ |
| 15 | Merge two dictionaries | ** | V1.0 | ️️️ |
| 16 | Topn dictionary | heapq,nlargest | V1.0 | ️️️ |
| 17 | Determine whether it is an anagram | collections, Counter | V1.0 | ️️️ |
| 18 | Logically merge dictionaries | ChainMap | V1.0 | ️️️️️ |
| 19 | sample sample sampling | random,sample | V1.0 | ️️️ |
| 20 | Rewash the dataset | shuffle | V1.0 | ️️️ |
| twenty one | 10 uniformly distributed coordinate points | random, uniform | V1.0 | ️️️ |
| twenty two | 10 coordinate points of Gaussian distribution | random,gauss | V1.0 | ️️️️ |
| twenty three | Whether they are sorting words for each other | collections,defaultdict | V1.0 | ️️️️ |
| twenty four | Whether str1 is rotated from str2 | str | V1.0 | ️️️ |
| 25 | Find the nth occurrence of position | enumerator | V1.0 | ️️️ |
| 26 | Find all duplicate elements | calendar,datetime | V1.0 | ️️️️ |
| 27 | joint statistics | Counter | V1.0 | ️️️️️ |
| 28 | Find the spherical distance between two points | math asin | V1.0 | ️️️️️ |
| 29 | Get file encoding | chardet | V1.0 | ️️️️️ |
| 30 | Format json string | json | V1.0 | ️️️️️ |
