Python method chaining and piping with asyncio support.
Project description
DotChain - Python method chaining and piping with asyncio support.
Install
pip install dotchain
Usage
Chain Synchronously
Call .Result()
to get the value.
value = DotChain(data | iterable).method().property.Result()
Chain Asynchronously
Do not call .Result()
when using await
.
value = await DotChain(data | iterable).method().property
NOTE: Must be in an event loop to use
await
.
Piping
Pipe
can be called anywhere in the chain to start piping the data.
Chain
can be called anywhere in the chain to start chaining the data again.
# Piping
value = DotChain(data | iterable).Pipe.method().other_method().Result()
# Chaining and Piping
value = DotChain(data | iterable).method().property.Pipe.other_method().Chain.property.Result()
Contexts
Contexts can be provided to resolve methods and properties so they can be used inline.
With
can be called anywhere in the chain to add or clear contexts.
import utils # contains `log(...)`
value = DotChain(data | iterable).With(utils).method().log().Result()
value = DotChain(data | iterable).With({'utils': utils}).method().utils.log().Result()
value = DotChain(data | iterable).With(self).method().utils.log().Result()
Call inline functions
value = DotChain(data | iterable).method().Call(lambda item: item.property).Result()
Examples
from dotchain import DotChain
import log_utils
# Chaining
order = DotChain(user).get_order('123').cancel().Result()
# Chaining with Piping
email_result = DotChain(user).get_order('123').cancel().Pipe.send_email().Result()
# With lookup contexts
order = DotChain(user).With(log_utils).get_order('123').cancel().Pipe.log_cancel().Result()
order = DotChain(user).With({'log_it': lambda order: log_utils.log_cancel(order)}).Pipe.log_it().Result()
# Inline callables
order = DotChain(user).get_order('123').cancel().Pipe.Call(lambda order: log_utils.log_cancel(order)).Result()
See Tests for more examples and usage.
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