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---
title: Mappings with arbitrary key names (MapPattern)
---
When you do not wish to let the user define the key
names in a mapping and and only specify what type the
keys are, use a MapPattern.
When you wish to specify the exact key name, use the
'Map' validator instead.
```python
from strictyaml import MapPattern, Int, Float, Str, Any, Seq, YAMLValidationError, load
from ensure import Ensure
schema = MapPattern(Str(), Int())
```
Equivalence 1:
```yaml
â: 1
b: 2
```
```python
Ensure(load(yaml_snippet, schema)).equals({u"â": 1, "b": 2})
```
Equivalence 2:
```yaml
a: 1
c: 3
```
```python
Ensure(load(yaml_snippet, schema)).equals({"a": 1, "c": 3})
```
Equivalence 3:
```yaml
a: 1
```
```python
Ensure(load(yaml_snippet, schema)).equals({"a": 1, })
```
With floats and ints:
```yaml
10.25: 23
20.33: 76
```
```python
Ensure(load(yaml_snippet, MapPattern(Float(), Int())).data).equals({10.25: 23, 20.33: 76})
```
With Int and List:
```yaml
1:
- ABC
2:
- DEF
```
```python
Ensure(load(yaml_snippet, MapPattern(Int(), Seq(Str()))).data).equals({1: ["ABC"], 2: ["DEF"]})
```
Invalid 1:
```yaml
b: b
```
```python
load(yaml_snippet, schema)
```
```python
strictyaml.exceptions.YAMLValidationError:
when expecting an integer
found arbitrary text
in "<unicode string>", line 1, column 1:
b: b
^ (line: 1)
```
Invalid 2:
```yaml
a: a
b: 2
```
```python
load(yaml_snippet, schema)
```
```python
strictyaml.exceptions.YAMLValidationError:
when expecting an integer
found arbitrary text
in "<unicode string>", line 1, column 1:
a: a
^ (line: 1)
```
More than the maximum number of keys:
```yaml
â: 1
b: 2
```
```python
load(yaml_snippet, MapPattern(Str(), Int(), maximum_keys=1))
```
```python
strictyaml.exceptions.YAMLValidationError:
while parsing a mapping
in "<unicode string>", line 1, column 1:
"\xE2": '1'
^ (line: 1)
expected a maximum of 1 key, found 2.
in "<unicode string>", line 2, column 1:
b: '2'
^ (line: 2)
```
Fewer than the minimum number of keys:
```yaml
â: 1
```
```python
load(yaml_snippet, MapPattern(Str(), Int(), minimum_keys=2))
```
```python
strictyaml.exceptions.YAMLValidationError:
while parsing a mapping
expected a minimum of 2 keys, found 1.
in "<unicode string>", line 1, column 1:
"\xE2": '1'
^ (line: 1)
```
Invalid with non-ascii:
```yaml
a: 1
b: yâs
c: 3
```
```python
load(yaml_snippet, schema)
```
```python
strictyaml.exceptions.YAMLValidationError:
when expecting an integer
found arbitrary text
in "<unicode string>", line 2, column 1:
b: "y\xE2s"
^ (line: 2)
```
!!! note "Executable specification"
Documentation automatically generated from
<a href="https://github.com/crdoconnor/strictyaml/blob/master/hitch/story/mappattern.story">mappattern.story
storytests.
|
