QUrlQuery

Inheritance diagram of PySide2.QtCore.QUrlQuery

Note

This class was introduced in Qt 5.0.

Synopsis

Functions

Detailed Description

The PySide2.QtCore.QUrlQuery class provides a way to manipulate a key-value pairs in a URL’s query.

It is used to parse the query strings found in URLs like the following:

../../_images/qurl-querystring.png

Query strings like the above are used to transmit options in the URL and are usually decoded into multiple key-value pairs. The one above would contain two entries in its list, with keys “type” and “color”. PySide2.QtCore.QUrlQuery can also be used to create a query string suitable for use in QUrl.setQuery() from the individual components of the query.

The most common way of parsing a query string is to initialize it in the constructor by passing it the query string. Otherwise, the PySide2.QtCore.QUrlQuery.setQuery() method can be used to set the query to be parsed. That method can also be used to parse a query with non-standard delimiters, after having set them using the PySide2.QtCore.QUrlQuery.setQueryDelimiters() function.

The encoded query string can be obtained again using PySide2.QtCore.QUrlQuery.query() . This will take all the internally-stored items and encode the string using the delimiters.

Encoding

All of the getter methods in PySide2.QtCore.QUrlQuery support an optional parameter of type QUrl.ComponentFormattingOptions , including PySide2.QtCore.QUrlQuery.query() , which dictate how to encode the data in question. Except for QUrl.FullyDecoded , the returned value must still be considered a percent-encoded string, as there are certain values which cannot be expressed in decoded form (like control characters, byte sequences not decodable to UTF-8). For that reason, the percent character is always represented by the string “%25”.

Handling of spaces and plus (“+”)

Web browsers usually encode spaces found in HTML FORM elements to a plus sign (“+”) and plus signs to its percent-encoded form (%2B). However, the Internet specifications governing URLs do not consider spaces and the plus character equivalent.

For that reason, PySide2.QtCore.QUrlQuery never encodes the space character to “+” and will never decode “+” to a space character. Instead, space characters will be rendered “%20” in encoded form.

To support encoding like that of HTML forms, PySide2.QtCore.QUrlQuery also never decodes the “%2B” sequence to a plus sign nor encode a plus sign. In fact, any “%2B” or “+” sequences found in the keys, values, or query string are left exactly like written (except for the uppercasing of “%2b” to “%2B”).

Full decoding

With QUrl.FullyDecoded formatting, all percent-encoded sequences will be decoded fully and the ‘%’ character is used to represent itself. QUrl.FullyDecoded should be used with care, since it may cause data loss. See the documentation of QUrl.FullyDecoded for information on what data may be lost.

This formatting mode should be used only when dealing with text presented to the user in contexts where percent-encoding is not desired. Note that PySide2.QtCore.QUrlQuery setters and query methods do not support the counterpart QUrl.DecodedMode parsing, so using QUrl.FullyDecoded to obtain a listing of keys may result in keys not found in the object.

Non-standard delimiters

By default, PySide2.QtCore.QUrlQuery uses an equal sign (“=”) to separate a key from its value, and an ampersand (“&”) to separate key-value pairs from each other. It is possible to change the delimiters that PySide2.QtCore.QUrlQuery uses for parsing and for reconstructing the query by calling PySide2.QtCore.QUrlQuery.setQueryDelimiters() .

Non-standard delimiters should be chosen from among what RFC 3986 calls “sub-delimiters”. They are:

sub-delims    = "!" / "$" / "&" / "'" / "(" / ")"
              / "*" / "+" / "," / ";" / "="

Use of other characters is not supported and may result in unexpected behaviour. PySide2.QtCore.QUrlQuery does not verify that you passed a valid delimiter.

class PySide2.QtCore.QUrlQuery
class PySide2.QtCore.QUrlQuery(queryString)
class PySide2.QtCore.QUrlQuery(url)
class PySide2.QtCore.QUrlQuery(other)
Parameters:

Constructs an empty PySide2.QtCore.QUrlQuery object. A query can be set afterwards by calling PySide2.QtCore.QUrlQuery.setQuery() or items can be added by using PySide2.QtCore.QUrlQuery.addQueryItem() .

Constructs a PySide2.QtCore.QUrlQuery object and parses the queryString query string, using the default query delimiters. To parse a query string using other delimiters, you should first set them using PySide2.QtCore.QUrlQuery.setQueryDelimiters() and then set the query with PySide2.QtCore.QUrlQuery.setQuery() .

Constructs a PySide2.QtCore.QUrlQuery object and parses the query string found in the url URL, using the default query delimiters. To parse a query string using other delimiters, you should first set them using PySide2.QtCore.QUrlQuery.setQueryDelimiters() and then set the query with PySide2.QtCore.QUrlQuery.setQuery() .

See also

QUrl.query()

Copies the contents of the other PySide2.QtCore.QUrlQuery object, including the query delimiters.

PySide2.QtCore.QUrlQuery.addQueryItem(key, value)
Parameters:
  • key – unicode
  • value – unicode

Appends the pair key = value to the end of the query string of the URL. This method does not overwrite existing items that might exist with the same key.

Note

This method does not treat spaces (ASCII 0x20) and plus (“+”) signs as the same, like HTML forms do. If you need spaces to be represented as plus signs, use actual plus signs.

PySide2.QtCore.QUrlQuery.allQueryItemValues(key[, encoding=QUrl.PrettyDecoded])
Parameters:
  • key – unicode
  • encodingPySide2.QtCore.QUrl.ComponentFormattingOptions
Return type:

list of strings

Returns the a list of query string values whose key is equal to key from the URL, using the options specified in encoding to encode the return value. If the key key is not found, this function returns an empty list.

PySide2.QtCore.QUrlQuery.clear()

Clears this PySide2.QtCore.QUrlQuery object by removing all of the key-value pairs currently stored. If the query delimiters have been changed, this function will leave them with their changed values.

static PySide2.QtCore.QUrlQuery.defaultQueryPairDelimiter()
Return type:PySide2.QtCore.QChar

Returns the default character for separating keys-value pairs from each other, an ampersand (“&”).

static PySide2.QtCore.QUrlQuery.defaultQueryValueDelimiter()
Return type:PySide2.QtCore.QChar

Returns the default character for separating keys from values in the query, an equal sign (“=”).

PySide2.QtCore.QUrlQuery.hasQueryItem(key)
Parameters:key – unicode
Return type:PySide2.QtCore.bool

Returns true if there is a query string pair whose key is equal to key from the URL.

PySide2.QtCore.QUrlQuery.isEmpty()
Return type:PySide2.QtCore.bool

Returns true if this PySide2.QtCore.QUrlQuery object contains no key-value pairs, such as after being default-constructed or after parsing an empty query string.

PySide2.QtCore.QUrlQuery.__ne__(other)
Parameters:otherPySide2.QtCore.QUrlQuery
Return type:PySide2.QtCore.bool

Returns true if other is not equal to this PySide2.QtCore.QUrlQuery . Otherwise, returns false .

See also

PySide2.QtCore.QUrlQuery.operator==()

PySide2.QtCore.QUrlQuery.__eq__(other)
Parameters:otherPySide2.QtCore.QUrlQuery
Return type:PySide2.QtCore.bool

Returns true if this object and the other object contain the same contents, in the same order, and use the same query delimiters.

PySide2.QtCore.QUrlQuery.query([encoding=QUrl.PrettyDecoded])
Parameters:encodingPySide2.QtCore.QUrl.ComponentFormattingOptions
Return type:unicode

Returns the reconstructed query string, formed from the key-value pairs currently stored in this PySide2.QtCore.QUrlQuery object and separated by the query delimiters chosen for this object. The keys and values are encoded using the options given by the encoding parameter.

For this function, the only ambiguous delimiter is the hash (“#”), as in URLs it is used to separate the query string from the fragment that may follow.

The order of the key-value pairs in the returned string is exactly the same as in the original query.

PySide2.QtCore.QUrlQuery.queryItemValue(key[, encoding=QUrl.PrettyDecoded])
Parameters:
  • key – unicode
  • encodingPySide2.QtCore.QUrl.ComponentFormattingOptions
Return type:

unicode

Returns the query value associated with key key from the URL, using the options specified in encoding to encode the return value. If the key key is not found, this function returns an empty string. If you need to distinguish between an empty value and a non-existent key, you should check for the key’s presence first using PySide2.QtCore.QUrlQuery.hasQueryItem() .

If the key key is multiply defined, this function will return the first one found, in the order they were present in the query string or added using PySide2.QtCore.QUrlQuery.addQueryItem() .

PySide2.QtCore.QUrlQuery.queryItems([encoding=QUrl.PrettyDecoded])
Parameters:encodingPySide2.QtCore.QUrl.ComponentFormattingOptions
Return type:

Returns the query string of the URL, as a map of keys and values, using the options specified in encoding to encode the items. The order of the elements is the same as the one found in the query string or set with PySide2.QtCore.QUrlQuery.setQueryItems() .

PySide2.QtCore.QUrlQuery.queryPairDelimiter()
Return type:PySide2.QtCore.QChar

Returns the character used to delimit between keys-value pairs when reconstructing the query string in PySide2.QtCore.QUrlQuery.query() or when parsing in PySide2.QtCore.QUrlQuery.setQuery() .

PySide2.QtCore.QUrlQuery.queryValueDelimiter()
Return type:PySide2.QtCore.QChar

Returns the character used to delimit between keys and values when reconstructing the query string in PySide2.QtCore.QUrlQuery.query() or when parsing in PySide2.QtCore.QUrlQuery.setQuery() .

PySide2.QtCore.QUrlQuery.removeAllQueryItems(key)
Parameters:key – unicode

Removes all the query string pairs whose key is equal to key from the URL.

PySide2.QtCore.QUrlQuery.removeQueryItem(key)
Parameters:key – unicode

Removes the query string pair whose key is equal to key from the URL. If there are multiple items with a key equal to key , it removes the first item in the order they were present in the query string or added with PySide2.QtCore.QUrlQuery.addQueryItem() .

PySide2.QtCore.QUrlQuery.setQuery(queryString)
Parameters:queryString – unicode

Parses the query string in queryString and sets the internal items to the values found there. If any delimiters have been specified with PySide2.QtCore.QUrlQuery.setQueryDelimiters() , this function will use them instead of the default delimiters to parse the string.

PySide2.QtCore.QUrlQuery.setQueryDelimiters(valueDelimiter, pairDelimiter)
Parameters:
  • valueDelimiterPySide2.QtCore.QChar
  • pairDelimiterPySide2.QtCore.QChar

Sets the characters used for delimiting between keys and values, and between key-value pairs in the URL’s query string. The default value delimiter is ‘=’ and the default pair delimiter is ‘&’.

../../_images/qurl-querystring.png

valueDelimiter will be used for separating keys from values, and pairDelimiter will be used to separate key-value pairs. Any occurrences of these delimiting characters in the encoded representation of the keys and values of the query string are percent encoded when returned in PySide2.QtCore.QUrlQuery.query() .

If valueDelimiter is set to ‘(‘ and pairDelimiter is ‘)’, the above query string would instead be represented like this:

http://www.example.com/cgi-bin/drawgraph.cgi?type-pie/color-green

Note

Non-standard delimiters should be chosen from among what RFC 3986 calls “sub-delimiters”. They are:

sub-delims    = "!" / "$" / "&" / "'" / "(" / ")"
              / "*" / "+" / "," / ";" / "="

Use of other characters is not supported and may result in unexpected behaviour. This method does not verify that you passed a valid delimiter.

PySide2.QtCore.QUrlQuery.setQueryItems(query)
Parameters:query

Sets the items in this PySide2.QtCore.QUrlQuery object to query . The order of the elements in query is preserved.

Note

This method does not treat spaces (ASCII 0x20) and plus (“+”) signs as the same, like HTML forms do. If you need spaces to be represented as plus signs, use actual plus signs.

PySide2.QtCore.QUrlQuery.swap(other)
Parameters:otherPySide2.QtCore.QUrlQuery

Swaps this URL query instance with other . This function is very fast and never fails.

PySide2.QtCore.QUrlQuery.toString([encoding=QUrl.PrettyDecoded])
Parameters:encodingPySide2.QtCore.QUrl.ComponentFormattingOptions
Return type:unicode

Returns this PySide2.QtCore.QUrlQuery as a PySide2.QtCore.QString . encoding can be used to specify the URL string encoding of the return value.