Python - Dictionary Exercises

Example 1

Python program to create a new dictionary by extracting the keys from a given dictionary.

```d1 = {"one":11, "two":22, "three":33, "four":44, "five":55}
keys = ['two', 'five']
d2={}
for k in keys:
d2[k]=d1[k]
print (d2)
```

It will produce the following output

```{'two': 22, 'five': 55}
```

Example 2

Python program to convert a dictionary to list of (k,v) tuples.

```d1 = {"one":11, "two":22, "three":33, "four":44, "five":55}
L1 = list(d1.items())
print (L1)
```

It will produce the following output

```[('one', 11), ('two', 22), ('three', 33), ('four', 44), ('five', 55)]
```

Example 3

Python program to remove keys with same values in a dictionary.

```d1 = {"one":"eleven", "2":2, "three":3, "11":"eleven", "four":44, "two":2}
vals = list(d1.values())#all values
uvals = [v for v in vals if vals.count(v)==1]#unique values
d2 = {}
for k,v in d1.items():
if v in uvals:
d = {k:v}
d2.update(d)
print ("dict with unique value:",d2)
```

It will produce the following output

```dict with unique value: {'three': 3, 'four': 44}
```

Exercise Programs

• Python program to sort list of dictionaries by values

• Python program to extract dictionary with each key having non-numeric value from a given dictionary.

• Python program to build a dictionary from list of two item (k,v) tuples.

• Python program to merge two dictionary objects, using unpack operator.

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