Update values in pandas dataframe
<p>I would like to update fields in my dataframe  :</p>

<pre><code>df = pd.DataFrame([
    {'Name': 'Paul', 'Book': 'Plane', 'Cost': 22.50},
    {'Name': 'Jean', 'Book': 'Harry Potter', 'Cost': 2.50},
    {'Name': 'Jim', 'Book': 'Sponge bob', 'Cost': 5.00}
])

          Book  Cost  Name
0         Plane  22.5  Paul
1  Harry Potter   2.5  Jean
2    Sponge bob   5.0   Jim
</code></pre>

<p>Changing names with this string : </p>

<pre><code>{"Paul": "Paula", "Jim": "Jimmy"}
</code></pre>

<p>to get this result : </p>

<pre><code>          Book  Cost  Name
0         Plane  22.5  Paula
1  Harry Potter   2.5  Jean
2    Sponge bob   5.0   Jimmy
</code></pre>

<p>any idea ?</p>