# fs.filesize¶

Functions for reporting filesizes.

The functions declared in this module should cover the different usecases needed to generate a string representation of a file size using several different units. Since there are many standards regarding file size units, three different functions have been implemented.

See also

fs.filesize.traditional(size)[source]

Convert a filesize in to a string (powers of 1024, JDEC prefixes).

In this convention, 1024 B = 1 KB.

This is the format that was used to display the size of DVDs (700 MB meaning actually about 734 003 200 bytes) before standardisation of IEC units among manufacturers, and still used by Windows to report the storage capacity of hard drives (279.4 GB meaning 279.4 × 1024³ bytes).

Parameters: size (int) – A file size. A string containing an abbreviated file size and units. str

Example

>>> filesize.traditional(30000)
'29.3 KB'

fs.filesize.decimal(size)[source]

Convert a filesize in to a string (powers of 1000, SI prefixes).

In this convention, 1000 B = 1 kB.

This is typically the format used to advertise the storage capacity of USB flash drives and the like (256 MB meaning actually a storage capacity of more than 256 000 000 B), or used by Mac OS X since v10.6 to report file sizes.

Parameters: int (size) – A file size. A string containing a abbreviated file size and units. str

Example

>>> filesize.decimal(30000)
'30.0 kB'

fs.filesize.binary(size)[source]

Convert a filesize in to a string (powers of 1024, IEC prefixes).

In this convention, 1024 B = 1 KiB.

This is the format that has gained adoption among manufacturers to avoid ambiguity regarding size units, since it explicitly states using a binary base (KiB = kibi bytes = kilo binary bytes). This format is notably being used by the Linux kernel (see man 7 units).

Parameters: int (size) – A file size. A string containing a abbreviated file size and units. str

Example

>>> filesize.binary(30000)
'29.3 KiB'