Basically I am reading in data from a .csv file. Output: Original DataFrame: Name Age 0 Amit 20 1 Cody 21 2 Drew 25 Data from Users.csv: Name\tAge 0 Amit\t20 1 Cody\t21 2 Drew\t25 Defaults to csv.QUOTE_MINIMAL. ... function is used to write object to a comma-separated values (csv) file. If you have set a float_format then floats are converted to strings and thus csv.QUOTE_NONNUMERIC will treat them as non-numeric.. quotechar str, default ‘"’. line_terminator str, optional. I set locale.setlocale(locale.LC_NUMERIC, '') and want floats to use local decimal point symbol. This can be achieved with "{:n}".format(value), but pandas uses %-formatting for strings (inside to_native_types function) which doesn't support %n format (as of Python 3.4 x64 Win 7). Defaults to csv.QUOTE_MINIMAL. If you have set a float_format then floats are converted to strings and thus csv.QUOTE_NONNUMERIC will treat them as non-numeric.. quotechar: str, default ‘"’. Character used to quote fields. We will be using the to_csv() function to save a DataFrame as a CSV file.. DataFrame.to_csv() Syntax : to_csv(parameters) Parameters : path_or_buf : File path or object, if None is provided the result is returned as a string. This works: df.to_csv(buf, sep='\t', header=header, index=False, float_format="%g") If we provide the path parameter, which tells the to_csv() function to write the CSV data in the File object and export the CSV file. Otherwise, the CSV data is returned in the string format. Pandas DataFrame - to_csv() function: The to_csv() function is used to write object to a comma-separated values (csv) file. quoting optional constant from csv module. If you have set a float_format then floats are converted to strings and thus csv.QUOTE_NONNUMERIC will treat them as non-numeric. Comma-separated values or CSV files are plain text files that contain data separated by a comma. String of length 1. See the following code. It was a bug in pandas, not only in “to_csv” function, but in “read_csv… String of length 1. The newline character or character sequence to use in the output file. We can pass a file object to write the CSV data into a file. Pandas to_csv method is used to convert objects into CSV files. I have been writing some unit tests and was getting some errors because my expected values were different from the ones I calculated in Excel. Let us see how to export a Pandas DataFrame to a CSV file. quoting: optional constant from csv module. Pandas DataFrame to_csv() function converts DataFrame into CSV data. Nowadays there is the float_format argument available for pandas.DataFrame.to_csv and the float_precision argument available for pandas.from_csv.. line_terminator: str, optional. UPDATE: Answer was accurate at time of writing, and floating point precision is still not something you get by default with to_csv/read_csv (precision-performance tradeoff; defaults favor performance). Nowadays there is the float_format argument available for pandas.DataFrame.to_csv and the float_precision argument available for pandas.from_csv. Export Pandas DataFrame to CSV file. The original is still worth reading to get a better grasp on the problem. sep : String of length 1.Field delimiter for the output file. Now let us learn how to export objects like Pandas Data-Frame and Series into a CSV … The newline character or character sequence to use in the output file. This type of file is used to store and exchange data. Character used to quote fields. I noticed a strange behavior when using pandas.DataFrame.to_csv method on Windows (pandas version 0.20.3). When calling the method using method 1 with a file path, it's creating a new file using the \r line terminator, I had to use method two to make it work. Then created a Pandas DataFrame using that dictionary and converted the DataFrame to CSV using df.to_csv() function and returns the CSV format as a string. Hey all, I just started using Pandas a few days ago and ran into a related issue.