Pandas continues update csv

def appendDFToCSV_void(df, csvFilePath, sep=","):
    import os
    if not os.path.isfile(csvFilePath):
        df.to_csv(csvFilePath, mode='a', index=False, sep=sep)
    elif len(df.columns) != len(pd.read_csv(csvFilePath, nrows=1, sep=sep).columns):
        raise Exception("Columns do not match!! Dataframe has " + str(len(df.columns)) + " columns. CSV file has " + str(len(pd.read_csv(csvFilePath, nrows=1, sep=sep).columns)) + " columns.")
    elif not (df.columns == pd.read_csv(csvFilePath, nrows=1, sep=sep).columns).all():
        raise Exception("Columns and column order of dataframe and csv file do not match!!")
    else:
        df.to_csv(csvFilePath, mode='a', index=False, sep=sep, header=False)

Source: stackoverflow.com

Pandas continues update csv

In [1]: df = pd.read_csv('foo.csv', index_col=0)

In [2]: df
Out[2]:
   A  B  C
0  1  2  3
1  4  5  6

In [3]: df + 6
Out[3]:
    A   B   C
0   7   8   9
1  10  11  12

In [4]: with open('foo.csv', 'a') as f:
             (df + 6).to_csv(f, header=False)

Source: stackoverflow.com

Similar codes

0 vote180 views1 answer
Python triée plusieurs fois avec virgule
Python
12 votes151 views6 answers
Python range function
Python
0 vote149 views1 answer
Tkinter set text
Python
0 vote214 views1 answer
Adam optimizer keras learning rate degrade
Python
9 votes156 views6 answers
How to use print in python
Python
16 votes161 views3 answers
Python gitignore
Python
9 votes195 views1 answer
Python remove duplicates from a list
Python
21 votes181 views3 answers
Python ceiling division
Python
11 votes157 views1 answer
Pandas xlsx to csv
Python
0 vote150 views1 answer
Correlation for specific columns
Python