Convert case of a pandas DataFrame column

Question

I have a DataFrame where the case of a particular column is inconsistent and I want to make it consistent:

In [1]: df = pd.DataFrame({"vals":["alpha","Beta","GAMMA"]})

In [2]: df
Out[2]: 
    vals
0  alpha
1   Beta
2  GAMMA

Is there is an easy, pythonic way to replace each value with the str.upper() of the string str ?

Answer 1

This should work for you:

df['vals'] = map(lambda x: x.upper(), df['vals'])

Or even:

df['vals'] = df['vals'].apply(lambda x: x.upper())

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Ps.: in recent versions you may also:

df['vals'] = df['vals'].str.upper()