Below I am using pandas to read my csv file in the following format:
dataframe = pandas.read_csv("test.csv", header=None, usecols=range(2,62), skiprows=1)
dataset = dataframe.values
How can I delete the first value in the very last column in the dataframe and then delete the last row in the dataframe?
Any ideas?
You can shift the last column up to get rid of the first value, then drop the last line.
df.assign(E=df.E.shift(-1)).drop(df.index[-1])
MVCE:
pd.np.random.seed = 123
df = pd.DataFrame(pd.np.random.randint(0,100,(10,5)),columns=list('ABCDE'))
Output:
A B C D E
0 91 83 40 17 94
1 61 5 43 87 48
2 3 69 73 15 85
3 99 53 18 95 45
4 67 30 69 91 28
5 25 89 14 39 64
6 54 99 49 44 73
7 70 41 96 51 68
8 36 3 15 94 61
9 51 4 31 39 0
df.assign(E=df.E.shift(-1)).drop(df.index[-1]).astype(int)
Output:
A B C D E
0 91 83 40 17 48
1 61 5 43 87 85
2 3 69 73 15 45
3 99 53 18 95 28
4 67 30 69 91 64
5 25 89 14 39 73
6 54 99 49 44 68
7 70 41 96 51 61
8 36 3 15 94 0
or in two steps:
df[df.columns[-1]] = df[df.columns[-1]].shift(-1)
df = df[:-1]
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