Wiki

User Tools

Site Tools

Trace: • javascript
python

Differences

This shows you the differences between two versions of the page.

Link to this comparison view

Both sides previous revisionPrevious revision
Next revision		Previous revision
python [2020/01/03 15:08] – adminpython [2021/05/06 11:15] (current) – admin
Line 1: Line 1:
-### Create a list of objects from a class+## 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 
 +ref:https://www.w3schools.com/python/python_classes.asp 
 + 
 +## Create a list of objects from a class
 ```python ```python
-    swatchList = [] +   swatchList = [] 
-    swatchList.append(Swatch("Sky1",22,40,76)) +   swatchList.append(Swatch("Sky1",22,40,76)) 
-    # Swatch is the name of the class+   # Swatch is the name of the class
 ``` ```
 <wrap lo> <wrap lo>
Line 10: 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 25: 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 31: Line 55:
 https://matplotlib.org/tutorials/introductory/usage.html#backends https://matplotlib.org/tutorials/introductory/usage.html#backends
  
 +```python
 +import matplotlib.pyplot as plt
 +plt.plot(x, y, color='black', linestyle = 'none', marker='o', markerfacecolor=(swatch.r/255.0,swatch.g/255.0,swatch.b/255.0), markersize=12)
 +```
 +
 +Note: ```markerfacecolor``` accept RGB, HEX and simple color text description: ```markerfacecolor=(r,g,b)```, ```markerfacecolor='#333399'```, ``` markerfacecolor='green'```
 +
 +### 3D plot:
 +https://jakevdp.github.io/PythonDataScienceHandbook/04.12-three-dimensional-plotting.html
  
-### Common Error+## Common Error
 ```python ```python
     File "main.py", line 15     File "main.py", line 15
python.1578035315.txt.gz · Last modified: (external edit)