Styjun

I am new to Python and programming in general.

I am attempting to plot value for every week on a bar chart. I would like to have ticks on the x axis under every plotted point so it is easy to understand the relation between values and dates.

I have a Pandas dataframe(df_clean) that looks like this (sorry for the french column name):

Data columns (total 20 columns):
Statut 23467 non-null object
P.O 23467 non-null object
Fournisseur 23467 non-null object
Date Comm. 23467 non-null object
Date Annul. 23466 non-null object
Date TPA 23467 non-null object
Qté Comm. 23467 non-null float64
Courant comm. 23467 non-null float64
Cout comm. 23467 non-null float64
Qté recue 23467 non-null float64
Courant recue 23467 non-null float64
Cout recue 23467 non-null float64
Qté souff. 23467 non-null float64
Courant souff. 23467 non-null float64
Cout souff. 23467 non-null float64
% recue 23467 non-null float64
% MB 23467 non-null float64
Premier jour sem. TPA 23467 non-null object
Year TPA 23467 non-null int64
Jour de la semaine TPA 23467 non-null object

My goal is to plot the sum of df_clean["Cout comm."] for every df_clean["Premier jour sem. TPA"]. I would like it to look like this:

Here is the code up to now

#Group by first day of week
sem_tpa_group = df_clean.groupby("Premier jour sem. TPA").agg("sum")
sem_tpa_group.reset_index(inplace=True)

#Limit the amount of week to show
sem_tpa_group = sem_tpa_group[sem_tpa_group["Premier jour sem. TPA"] > date.today()]

#Create graph
fig = plt.figure()
ax = plt.subplot(111)
plt.plot(sem_tpa_group["Premier jour sem. TPA"], sem_tpa_group["Cout comm."],'o-',label='Ord. cost')
plt.plot(sem_tpa_group["Premier jour sem. TPA"], sem_tpa_group["Cout recue"],'o-',label='Rec. cost')
plt.legend(loc=1)
plt.ylabel('Cost')
plt.xlabel('Week date')
plt.grid()
plt.show()

The result is this:

Would anyone be able to tell me how to get tick information for every plotted point on the x axis?

I tried plt.xticks() without any result though I am not sure I did use it the right way.

Thanks a lot for everything