pandas: updating a row.
# remove a row, and append it again. I need to remove a Ze value at a freq, and update it with a new value.
# Don't think I can update the value directly.
print df # original shows all rows
tmp = df[abs(df['A'] - -0.671540) < 1E-3] # copy
df = df[abs(df['A'] - -0.671540) > 1E-3] # this shows the first index to be removed.
print df
print df.append(tmp, ignore_index = True)
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