Python graph does not display values correctly

Question

I’m trying to learn how to make graphics in Python. I made one now and it didn’t get very good:

All dates are on April 10, 2017, coming only the time from 07h50:00 until 08h40:00 (GMT -3h) In the picture, appeared to date today and, because of this, disappeared the points. On the time axis (X axis) was to appear only the date of April 10, 2017 with the variation of hour, minute and second! This is the problem How to fix?

import matplotlib.pyplot as plt
    import matplotlib.dates as dates
    from datetime import datetime, timedelta


    x = []
    y = []

    dataset = open("dataset_semAtaques.csv","r") ##separacao no csv eh por virgulas

    for line in dataset:
        line = line.strip() #23,24\n -> 23,24 retira a quebra de linha
        X,Y = line.split(",") #separador eh a virgula
        x.append( float(X))
        y.append(float (Y))

    dataset.close()


    x1 = [datetime.fromtimestamp(int(d)) for d in x]


    plt.gca().xaxis.set_major_formatter(dates.DateFormatter('%m/%d/%Y %H:%M:%S'))

    plt.plot(x1, y, 'ro')

    plt.title("Gráfico do número de Conexões por segundo antes do Ataque")
    plt.ylabel("Numero de conexões por segundo")
    plt.xlabel('Tempo')
    plt.gcf().autofmt_xdate()
    plt.show()

The file dataset_semAtaques.csv follows below:

1491821400,0
1491821580,0
1491821760,0
1491821940,0
1491822120,3
1491822300,3
1491822480,2
1491822660,2
1496012764,3
1491823020,2
1491823200,2
1491823380,2
1491823560,3
1491823740,2
1491823920,2
1491824100,2
1491824280,3
1491824400,2

Answer 1

Simply set the x-axis boundaries using the function set_xlim, as in the example below:

# . . .
plt.title("Grafico do numero de Conexoes por segundo antes do Ataque")
plt.ylabel("Numero de conexoes por segundo")
plt.xlabel('Tempo')

# Linha adicionada:
plt.gca().set_xlim([datetime(2017, 4, 10, 0, 0, 0), datetime(2017, 4, 10, 23, 59, 59)])

plt.gcf().autofmt_xdate()
plt.show()

Answer 2

In the picture, appeared to date today and, because of this, disappeared the points.

Not gone. Try to enlarge the image. They are on the edges.

I converted one of your dates to the suggested format and note that there is no millisecond information in it:

>>> datetime.datetime.fromtimestamp(1491821400).strftime('%m/%d/%Y %H:%M:%S.%f')
'04/10/2017 05:50:00.000000'

In CSV generation, check the date format. It may not be enough for your chart.