Revision 22/5

#x=[7,1,2,3,4]
x=7,1,2,3,4
#del x[1]
#x.remove(1)
#print(x)
#print(id(x))
#x=[]
#print(id(x))
#x.sort()
#y=sorted(x)
print(x)

d={'a':1, 'b':2}
print(d.keys())
print(d.values())
print(d.items())

x=[1,2,3,4]
print(5 in x) #5 not in the list = False
print (1 in d.values())