UDict + cmp_generator

examples/udict.md

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+# UDict
+
+## Introduction
+
+UDict is class which is simplifying working with Python dicts.
+It has many methods, properties, magic methods.
+
+Firstly, import `UDict` from `ufpy`
+```python
+from ufpy import UDict
+```
+
+## Create UDict
+
+For creating UDict you should use this code:
+```python
+d = UDict({'id': 2, 'content': 'hello, world'})
+# for string keys you can use this way:
+d = UDict(id=2, content='hello, world')
+```
+
+You can also define `default` value for items when you use item's getter:
+```python
+d = UDict(id=2, content='hello, world', default=0)
+```
+
+## Get items
+
+For getting items you should use the way you use in lists and dicts:
+use `UDict[key]` syntax:
+```python
+d['id'] # 2
+```
+
+You can also use index of key or slice of indexes of keys:
+
+> [!CAUTION]
+> In this class first index is 1
+
+```python
+d[1] # 2
+d[:] # u{'id': 2, 'content': 'hello, world'} (UDict object)
+```
+
+You can also use `get()` method.
+You can get item by its key using `key` kwarg,
+you can get item by its index using `index` kwarg,
+and you get item key by its value using `value` kwarg.
+
+Also you can define `default` only for this calling of `get()` using `default` kwarg.
+
+Example:
+```python
+d = UDict({2: 3, 1: 4}, default=None)
+d[2] # 3
+d.get(index=2) # 4
+d.get(key=1) # also 4
+d.get(value=3) # 2
+
+d.get(key=3) # None
+d.get(key=3, default='null') # 'null'
+```
+
+## Set items
+
+For setting items you should use the way you use in lists and dicts:
+use `UDict[key] = value` syntax:
+```python
+d['id'] = 3
+```
+
+Also, you can use indexes and slices when you are setting items:
+```python
+d[1] = 2
+d[2:6:2] = 8
+d[:3] = 1, 2, 3
+```
+
+## Delete items
+
+For deleting items you should use the way you use in lists and dicts:
+use `del UDict[key]` syntax:
+```python
+del d['id']
+```
+
+Also, you can use indexes and slices:
+```python
+del d[1]
+del d[:] # all UDict will become empty
+```
+
+## Get length of dict
+
+You can get length of dict using inbuilt `len()` function
+
+```python
+d = UDict(hello=1, hi=2)
+len(d) # 2
+```
+
+## Iterate dict: `keys`, `values`, `items` properties
+
+You can iterate dict using `for key, value in UDict` syntax.
+
+```python
+d = UDict(hello=1, hi=2)
+for key, value in d:
+    print(key, value)
+
+# out:
+#
+# hello 1
+# hi 2
+```
+
+Also, you can iterate `items` property for this result
+
+```python
+for key, value in d.items:
+    ...
+```
+
+If you want iterate only all keys or values, use `keys` or `values` properties
+
+```python
+for key in d.keys:
+    ...
+
+for value in d.values:
+    ...
+```
+
+## Check that dict is empty or not empty
+
+You can use `is_empty()` method to check that UDict is empty:
+```python
+d = UDict()
+print(d.is_empty()) # True
+
+d['hello'] = 'world'
+print(d.is_empty()) # False
+```
+
+You also can use `if UDict` or `bool(UDict)` syntax:
+```python
+d = UDict()
+print(bool(d)) # False
+
+d['hello'] = 'world'
+print(bool(d)) # True
+
+if d:
+    print('True!')
+
+# out: True!
+```
+
+## Check that key or item in dict
+
+You can check that key in dict:
+```python
+d = UDict(hi=1, hello=2)
+
+print('hi' in d) # True
+print('hii' in d) # False
+```
+
+You can also check that item in dict:
+```python
+d = UDict(hi=1, hello=2)
+
+print(('hi', 1) in d) # True
+print(('hi', 11) in d) # False
+```
+
+## Convert to `str` type and using in `print`
+
+### Print dict
+
+`print` uses `repr()` therefore `UDict` supports `repr()`
+
+```python
+d = UDict(hi=1, hello=2)
+print(d) # u{'hi': 1, 'hello': 2}
+print(repr(d)) # u{'hi': 1, 'hello': 2}
+```
+
+### Convert to str
+
+You can use inbuilt `str()` class for converting `UDict` to `str` type
+
+```python
+d = UDict(hi=1, hello=2)
+print(str(d)) # {'hi': 1, 'hello': 2}
+```
+
+## Comparing dicts
+
+You can compare `UDict`s using inbuilt compare operators
+(`==`, `!=`, `>`, `>=`, `<`, `<=`):
+
+> [!NOTE]
+> When you use equal and not equal compare operator, dicts are comparing by its items and length,
+> but in other compare operators dicts are comparing only by its length.
+> 
+> For example, `d > d2 -> len(d) > len(d2)`, etc.
+
+```python
+d = UDict(hi=1, hello=2)
+d2 = UDict(hi=1, hello=2)
+d3 = UDict(hi=1, hello=2, world=3)
+
+print(d == d2) # True
+print(d != d2) # False
+print(d < d3) # True
+print(d <= d3) # True
+print(d3 > d) # True
+print(d3 >= d) # True
+```
+
+## Math operations
+
+You can use inbuilt math operators (`+`, `-`, `*`, `/`, `+=`, `-=`, `*=`, `/=`)
+with `UDict`s:
+
+> [!NOTE]
+> When you use sum and sub math operators (`+`, `-`) dicts are summing or subtracting, but
+> when you use other math operators dict will be multiplying or dividing by integer or dict.
+> 
+>When dict it works like this:
+> 
+> d * {'hello': 2, 'hi': 0.5}
+> 
+> d['hello'] * 2
+> 
+> d['hi'] * 0.5
+
+```python
+d = UDict(hi=1, hello=2)
+print(d + {'world': 3}) # u{'hi': 1, 'hello': 2, 'world': 3}
+print(d - {'hello': 2}) # u{'hi': 1}
+
+print(d * 2) # u{'hi': 2, 'hello': 4}
+print(d * {'hi': 2}) # u{'hi': 2, 'hello': 2}
+
+print(d / 2) # u{'hi': 0.5, 'hello': 1}
+print(d / {'hi': 2}) # u{'hi': 0.5, 'hello': 2}
+```
+
+## Negative dict
+
+You can use unary minus with dicts:
+```python
+d = UDict(hi=1, hello=2)
+print(-d) # u{'hi': -1, 'hello': -2}
+```
+
+## Reverse dict
+
+You can reverse dict using `reverse()` or `reversed()` method.
+> [!CAUTION]
+> When you use `reverse()`, dict updates in contrast to `reversed()`. Be careful!
+> 
+> ```python
+> # reverse()
+> d = UDict(b=1, a=2)
+> print(d.reverse()) # u{'a': 2, 'b': 1}
+> print(d) # u{'a': 2, 'b': 1}
+> 
+> # reversed()
+> d = UDict(b=1, a=2)
+> print(d.reversed()) # u{'a': 2, 'b': 1}
+> print(d) # u{'b': 1, 'a': 2}
+> ```
+
+```python
+d.reverse()
+d.reversed()
+```
+
+Also, you can use `~` operator and `reversed()` class. They are equivalents of `UDict.reversed()`:
+```python
+~d
+reversed(d)
+```
+
+## Sort dict
+
+You can use `sort()` and `sorted()` methods for sorting UDict.
+`sort()` is updating dict, `sorted()` - isn't.
+
+```python
+# sort()
+d = UDict(b=1, a=2)
+print(d.sort()) # u{'a': 2, 'b': 1}
+print(d) # u{'a': 2, 'b': 1}
+
+# sorted()
+d = UDict(b=1, a=2)
+print(d.sorted()) # u{'a': 2, 'b': 1}
+print(d) # u{'b': 1, 'a': 2}
+```