How to plot the datas from user input?

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Python

Numpy

i am practicing and out of ideas anymore on how to plot all column and just the two columns only. i have this code here and it didn't at plotting the datas. it only says that

Traceback (most recent call last):
  File "C:/pythonnnn/pandas/midterm list.py", line 23, in <module>
    b.plot(x='ylevel', y='average')
AttributeError: 'dict' object has no attribute 'plot'

pls help at plotting 2 column or all columns.

What I have tried:

import pandas as pd
import matplotlib.pyplot as plt
n=int(input("How many times: "))
name=[]
section=[]
ylevel=[]
average=[]

for i in range(n):
    sn = input("Name: ")
    sec=input("Section: ")
    yl=input("Level: ")
    avg=input("Average: ")

    name.append(sn)
    section.append(sec)
    ylevel.append(yl)
    average.append(avg)

b={'Name': name,'Sec':section,'Level':ylevel,'Average':average}
c=pd.DataFrame(b)
print(c)
b.plot(x='ylevel', y='average')
print(b)