python
Differences
This shows you the differences between two versions of the page.
| Both sides previous revision Previous revision Next revision | Previous revision | ||
|
python [2020/01/19 22:45] admin |
python [2021/05/06 11:15] (current) admin |
||
|---|---|---|---|
| Line 1: | Line 1: | ||
| + | ## Data Type | ||
| + | |||
| + | ^ Example ^ Data Type ^ | ||
| + | | x = "Hello World" | str | | ||
| + | | x = 20 | int | | ||
| + | | x = 20.5 | float | | ||
| + | | x = 1j | complex | | ||
| + | | x = ["apple", "banana", "cherry"] | list | | ||
| + | | x = ("apple", "banana", "cherry") | tuple | | ||
| + | | x = range(6) | range | | ||
| + | | x = {"name" : "John", "age" : 36} | dict | | ||
| + | | x = {"apple", "banana", "cherry"} | set | | ||
| + | | x = frozenset({"apple", "banana", "cherry"}) | frozenset | | ||
| + | | x = True | bool | | ||
| + | | x = b"Hello" | bytes | | ||
| + | | x = bytearray(5) | bytearray | | ||
| + | | x = memoryview(bytes(5)) | | | ||
| + | |||
| + | ref: https://medium.com/@shawnren527/learn-about-python-3-data-types-numbers-and-strings-76c75a917c9b | ||
| + | |||
| ### Class | ### Class | ||
| ref:https://www.w3schools.com/python/python_classes.asp | ref:https://www.w3schools.com/python/python_classes.asp | ||
| - | ### Create a list of objects from a class | + | ## Create a list of objects from a class |
| ```python | ```python | ||
| swatchList = [] | swatchList = [] | ||
| Line 13: | Line 33: | ||
| </wrap> | </wrap> | ||
| - | ### Format Variables | + | ## Format Variables |
| ```python | ```python | ||
| print('%s %.2f' % ("hue =",swSky1.hue)) | print('%s %.2f' % ("hue =",swSky1.hue)) | ||
| print('{0} {1:.2f}'.format("hue =",swSky1.hue)) | print('{0} {1:.2f}'.format("hue =",swSky1.hue)) | ||
| print("hue =", format(swSky1.hue,'.2f')) | print("hue =", format(swSky1.hue,'.2f')) | ||
| + | # f:float, x:hex, s:string | ||
| ``` | ``` | ||
| The three lines above give the same result ````hue = 220.00````.\\ | The three lines above give the same result ````hue = 220.00````.\\ | ||
| Line 28: | Line 49: | ||
| - | ### Plot (matplotlib) | + | ## Plot (matplotlib) |
| py37-matplotlib has the following notes:\\ | py37-matplotlib has the following notes:\\ | ||
| The default backend is the interactive Mac OS X backend. Different backends can be specified using the | The default backend is the interactive Mac OS X backend. Different backends can be specified using the | ||
| Line 41: | Line 62: | ||
| Note: ```markerfacecolor``` accept RGB, HEX and simple color text description: ```markerfacecolor=(r,g,b)```, ```markerfacecolor='#333399'```, ``` markerfacecolor='green'``` | Note: ```markerfacecolor``` accept RGB, HEX and simple color text description: ```markerfacecolor=(r,g,b)```, ```markerfacecolor='#333399'```, ``` markerfacecolor='green'``` | ||
| - | ### Common Error | + | ### 3D plot: |
| + | https://jakevdp.github.io/PythonDataScienceHandbook/04.12-three-dimensional-plotting.html | ||
| + | |||
| + | ## Common Error | ||
| ```python | ```python | ||
| File "main.py", line 15 | File "main.py", line 15 | ||
python.1579445102.txt.gz · Last modified: 2020/01/19 22:45 by admin