dict1 = {"asdf":34,  "zxcv":456, "qwerty":123, 234:"hello"}
print(type(dict1))
print(len(dict1))

print(dict1)
print(dict1.items())   #list of tuples(key,value)
print(dict1.keys())
print(dict1.values())

print()

# initialize with key=value arguments. NB not "", also key cannot be number
dict2 = dict(asdf=123, qwerty=55555, zxcv=4321)
print("dict2:",dict2)

# initialize with list of tuples of key,value
dict3 = dict([("asdf",345),("qwerty",99999),("zxcv",123),(234,"hello")])
print("dict3:",dict3)

print()
for i in dict1.items():    #tuple of (key,value)
    print(i, end="  ")
print()
for k,v in dict1.items():    
    print(k,v, end="  ")
print()

for k in dict1.keys():
    print(k,dict1[k], end="  ")
print()
for k in dict1:         #is the keys
    print(k,dict1[k], end="  ")
print()
    
for v in dict1.values():
    print(v, end="  ")
print()
#for k,v in dict1:
#    print(k,v, end="   ")
#print()




if "zxcv" in dict1.keys():
    print("zxcv  is in dict1.keys()")
if 123 in dict1.values():
    print("123  is in dict1.values()")

print(dict1.get("DFGDFG","Not found"))

# dictionary comprehension.  "merge" 2 lists into one dict
keys = ['color', 'fruit', 'pet']
values = ['blue', 'apple', 'dog']
a_dict = {key: value for key, value in zip(keys, values)}
print(a_dict)

# switch key and value into new dictionary
a_dict = {'one': 1, 'two': 2, 'thee': 3, 'four': 4}
new_dict = {}
for key, value in a_dict.items():
    new_dict[value] = key
print(new_dict)

#or do the switch this way:
a_dict = {'one': 1, 'two': 2, 'thee': 3, 'four': 4}
new_dict = {value: key for key,value in a_dict.items()}
print(new_dict)

# copy
d1 = dict1.copy()
d2 = dict(dict1)