# obspy.core.inventory.util.Frequency

class `Frequency`(value, lower_uncertainty=None, upper_uncertainty=None)

  Bases: `obspy.core.util.obspy_types.FloatWithUncertaintiesFixedUnit`

  Frequency object

  Parameters: | value (float) Frequency value lower_uncertainty (float) Lower uncertainty (aka minusError) upper_uncertainty (float) Upper uncertainty (aka plusError)

  Attributes

  `__dict__` |
  `__doc__` | str(object=’‘) -> str
  `__module__` | str(object=’‘) -> str
  `__weakref__` | list of weak references to the object (if defined)
  `imag` | the imaginary part of a complex number
  `real` | the real part of a complex number
  `unit` | str(object=’‘) -> str

  Public Methods

  `as_integer_ratio` | Return a pair of integers, whose ratio is exactly equal to the original float and with a positive denominator.
  `conjugate` | Return self, the complex conjugate of any float.
  `fromhex` | Create a floating-point number from a hexadecimal string.
  `hex` | Return a hexadecimal representation of a floating-point number.
  `is_integer` | Return True if the float is an integer.

  Special Methods

  `__dir__` | default dir() implementation
  `__format__` | Formats the float according to format_spec.
  `__getformat__` | You probably don’t want to use this function.
  `__getnewargs__` |
  `__iadd__` |
  `__imul__` |
  `__init__` |
  `__new__` |
  `__reduce__` | helper for pickle
  `__reduce_ex__` | helper for pickle
  `__round__` | Return the Integral closest to x, rounding half toward even.
  `__setformat__` | You probably don’t want to use this function.
  `__sizeof__` | size of object in memory, in bytes
  `__subclasshook__` | Abstract classes can override this to customize issubclass().
  `__trunc__` | Return the Integral closest to x between 0 and x.

### Thank you!

We would like to thank our contributors, whose efforts make this software what it is. These people have helped by writing code and documentation, and by testing. They have created and maintained this product, its associated libraries and applications, our build tools and our web sites.

#### Contributors

- Ackerley, Nick
- Allgeyer, Sebastien
- Ammon, Charles J.
- Antunes, Emanuel
- Arnarsson, Ólafur St.
- Bank, Markus
- Barsch, Robert
- Behr, Yannik
- Bernardi, Fabrizio
- Bernauer, Felix
- Bes de Berc, Maxime
- Beyreuther, Moritz
- Boltz, Shawn
- Bonaimé, Sébastien
- Carothers, Lloyd
- Chamberlain, Calum
- Chambers, Derrick
- Chen, Zhao
- Clark, Adam
- Danecek, Peter
- Egdorf, Sven
- Engels, Fabian
- Ermert, Laura
- Eulenfeld, Tom

- Fabbri, Tommaso
- Falco, Nicholas
- Fee, Jeremy
- Grellier, Clément
- Grunberg, Marc
- Hammer, Conny
- Heimann, Sebastian
- Heiniger, Lukas
- Hope, Gaute
- Igel, Heiner
- Inza, Adolfo
- Isken, Marius
- Ketchum, David
- Koymans, Mathijs
- Kremers, Simon
- Kress, Victor
- Krieger, Lars
- Krischer, Lion
- Kula, Damian
- Käufl, Paul
- Köhler, Andreas
- Lecocq, Thomas
- Leeman, John
- Legovini, Paride

- Lesage, Philippe
- Li, Yulin
- Lomax, Anthony
- Lopes, Rui L.
- MacCarthy, Jonathan
- Maggi, Alessia
- Martin, Henri
- Medlin, Andrew
- Megies, Tobias
- Meschede, Matthias
- Michelini, Alberto
- Miller, Nathaniel C.
- Morgenstern, Bernhard
- Nof, Ran Novitsky
- Panning, Mark P.
- Parker, Tom
- Pestourie, Romain
- Rapagnani, Giovanni
- Reyes, Celso
- Ringler, Adam
- Rothenhäusler, Nicolas
- Russo, Emiliano
- Sales de Andrade, Elliott

- Satriano, Claudio
- Saul, Joachim
- Scheingraber, Chris
- Schneider, Simon
- Sippl, Christian
- Snoke, Arthur
- Stange, Stefan
- Stähler, Simon C.
- Sullivan, Benjamin
- Tian, Dongdong
- Trabant, Chad
- Trani, Luca
- Uieda, Leonardo
- Walker, Andrew
- Walther, Marcus
- Wassermann, Joachim
- Williams, Mark C.
- Winkelman, Andrew
- Zaccarelli, Riccardo
- Zad, Seyed Kasra Hosseini
- Zhu, Lijun
- van Driel, Martin
- van Wijk, Kasper

#### Funds

ObsPy was partially funded by the

- German Science Foundation (DFG) via grant DFG IG 16/9-1
- German Ministry for Education and Research (BMBF), GEOTECHNOLOGIEN grant 03G0646H.
- NERA project (Network of European Research Infrastructures for Earthquake Risk Assessment and Mitigation) under the European Community's Seventh Framework Programme (FP7/2007-2013) grant agreement n° 262330
- Leibniz Institute for Applied Geophysics (LIAG)
- VERCE EU-FP7 project (no. 283543)