import matplotlib.pyplot as plt
plt.rcParams["figure.figsize"]=[7.00,3.50]
plt.rcParams["figure.autolayout"]=True
data =[("a",1),("c",3),("d",4),("b",2),("e",7),("f",3),('g',2)]
ind =[]
fre =[]for item in data:
ind.append(item[0])
fre.append(item[1])
plt.bar(ind, fre)
plt.show()