mylist = [['apple', 3], ['banana', 2], ['pear', 5], ['orange', 1]]
mydict = {}
for i in mylist:
    str1=i[0]
    str2=i[1]
    mydict[str1] = str2
print(mydict)

{'apple': 3, 'banana': 2, 'pear': 5, 'orange': 1}