Python Matplotlib : savefig graphs in for loop

Question

I try to save scatter plots created with a for loop:

for i in df["Canal de distribution"].unique():
    fig, ax = plt.subplots(figsize=(10,7))
    ax.scatter(df[df["Canal de distribution"]==str(i)]["date"],df[df["Canal de distribution"]==str(i)]["Prix"],alpha=.7)
    fig.savefig("distribution données canal : {} .png".format(i), transparent=False, dpi=300,bbox_inches='tight', facecolor=(1,1,1,0))
    plt.show()

The graphs are created but nothing is saved. Any idea what I am missing ?

EDIT: I noticed a filed saved under the name "distribution données canal " (same as in savefig) but without any extension and just one, weird weird

Very odd - it ought to work. Can you just check if you are in the correct directory? Insert print(os.getcwd()). — alani
– alani, Commented Jul 5, 2020 at 21:09
There are settings in our pc that controls whether we see the extension or not. — Red
– Red, Commented Jul 5, 2020 at 21:14
Still very strange. Can you try without the colon? What operating system are you using? — alani
– alani, Commented Jul 5, 2020 at 21:16
I suggested it because it was truncated at the colon, based on your report, and I'm aware that Windows uses colon as a separator for the drive letter, so was prepared to believe that it might do something odd under Windows (though I don't use Windows myself). Hence my question about OS. — alani
– alani, Commented Jul 5, 2020 at 21:21

Red · Accepted Answer · 2020-07-05 21:08:27Z

0

Change the:

fig.savefig("distribution données canal : {} .png".format(i), transparent=False, dpi=300,bbox_inches='tight', facecolor=(1,1,1,0))

To:

plt.savefig("distribution données canal : {} .png".format(i), transparent=False, dpi=300,bbox_inches='tight', facecolor=(1,1,1,0))

answered Jul 5, 2020 at 21:08

Red

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1 Comment

Ad D Over a year ago

Thanks for your reply Ann, unfortunately the result is the same: graph displayed but not saved

Ad D · Accepted Answer · 2020-07-05 21:23:49Z

0

Using alaniwi's input I removed the colon from my savefig title and it worked

answered Jul 5, 2020 at 21:23

Ad D

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2 Comments

Tom Over a year ago

See this answer. It looks like it is just rooted that colon (':') is a non-allowed character for files on some systems. Would be nice if it gave a warning though!

Ad D Over a year ago

Good call Tom, lesson learned I will not use it in my titles for some time!

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