5 examples of 'python check if value exists in list' in Python

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def in_list(value, arg):
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    return value in ( arg or [] )

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def _value_exists(self, value):
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    """
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    Checks if the value exists in the storage
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    @param value: value to be checked in storage
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    @type value: string
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    @return: result of select SQL query
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    @rtype: tuple
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    """
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    return run_sql("""SELECT seq_value FROM seqSTORE
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                      WHERE seq_value=%s AND seq_name=%s""",
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                      (value, self.seq_name))

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def _find_dict_in_list(list_of_dict, key, val):
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    """Given a list of dictionaries, return the first dictionary that has the
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    given key:value pair.
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    """
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    try:
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        for d in list_of_dict:
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            if (key, val) in d.items():
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                return d
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    except TypeError:
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        pass

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def contains_val(data, key, value):
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    """
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    check if certain key has certain value, return true if so and false otherwise
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    """
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    # try to get value variable from parser specific variables
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    value = _ttp_["parser_object"].vars.get(value, value)
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    if not value in data.get(key, ""):
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        return data, False
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    return data, None

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def check_if_one_item_has_property_v1(my_list, key):
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    """
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    Return true if at least one item has a
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    property.
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    """
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    list_position = 0
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    while list_position < len(my_list) and my_list[list_position] != key:
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        list_position += 1
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    if list_position < len(my_list):
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        # Found an item with the property
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        return True
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    else:
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        # There is no item with the property
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        return False