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When drawing with matplotlib's pyplot library, you will often find that various open source code does not specify "color" in a consistent way. It is found that there are 8 ways to specify color.

Eight ways are as follows:

Use floating point values between [0,1] to represent RGB/RGBA color values

Use hexadecimal RGB/RGBA strings to represent colors

Use color initials

Use the color name of X11/CSS4

Use xkcd color

T10 colors of Tableau

Circular colors represented by CN

Floating-point value represented by a string

Through the color settings in the above 8, almost all color choices can be achieved. The second of the eight ways should be the best, which can be flexibly selected according to the hexadecimal color code. The following details each way of the specific concept and use of the process, and gives the source code.

1. Use floating-point values between [0,1] to represent RGB/RGBA color values.

For the RGB/RGBA color model, the value of each color component is between 0 and 255. After zooming, it becomes a floating-point number between [0prime1] as the parameter value of the color:

Draw_bar ((255Compact 255,255x255,0Universe), ax1, "tuple of RGB/RGBA")

The figure is as follows:

2. Use hexadecimal RGB/RGBA string to represent color

In the color representation method, the hexadecimal values of six digits represent the three colors of RGB, that is, the conversion of 0-255s. For example, "# FF3300" means that the red component is FF, the green component is 33, and the blue component is 00.

At this point, the code that uses the hexadecimal string as the color parameter is as follows:

Draw_bar ("# FF0000", ax2, "hex color code")

The figure is as follows:

3. Use the initials of the color

According to the convention, the first letter of the color in {'baked,' gelled, 'rusted,' clocked, 'milled,' yearly, 'knight,' w'} can be used as a color parameter:

Draw_bar ("b", ax, "color's first char")

The figure is as follows:

4. Use the color name of X11/CSS4

According to the color definition in HTML, you can use the color name directly as a parameter, and there are many specific names. It is recommended that you can consult the relevant information.

The mode of use is as follows:

Draw_bar ("pink", ax, "color's name")

The figure is as follows:

5. Use xkcd color

According to the color name provided by xkcd website [2], it can be used as a color parameter:

Draw_bar ("violet", ax, "xkc color")

The figure is as follows:

6. T10 colors of Tableau

By using the color defined by Tableau, you can use the {'tab:blue',' tab:orange', 'tab:green'} given in [1] as color parameters:

Draw_bar ("tab:brown", ax, "T10")

The figure is as follows:

7. Circular colors represented by CN

According to [1], this should be a built-in representation, and no specific documentation has been found for the time being:

Draw_bar ("C2", ax, "Cn")

The figure is as follows:

8. Floating-point values represented by strings

This method is rarely introduced and used less frequently, and it is not as convenient as floating-point RGB mode:

Draw_bar (color_type= "0.2", ax=ax, title=" float string ")

The figure is as follows:

9. Drawing function and summary

The definition of the draw_bat () function in the previous analysis is as follows:

Def draw_bar (color_type, ax, title): "" draw with different color formats Parameters-color_type:object any feasible color type ax: Ax drawing axis title:string the title of the subgraph "" x = np.linspace (1,6) 6) y = np.linspace (0.2,1,6) ax.bar (xonomx, height=y, width=0.6, color=color_type) ax.set_title (title) return None

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