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pandas create new column and fill with constant value

df["new_column"] = "abcd"
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pandas add column with constant value

# Adding Column
df['Column Name'] = 'Value'
# Pass a list also, but it should match number of rows.
df['Column Name'] = ['should', 'match_rows','otherwise', 'error']
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add constant to all values of columns in dataframe python

df["Gene1"] = df["Gene1"] + 1
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python add column with constant value

df['new'] = '1'
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