Python-izmなる勉強になるサイトを見つけたため、AWS Lambdaで試してみた。

基礎編

文字列

def lambda_handler(event, context):
	    testnum = "123"
	    testnum = testnum + "456"
	    testnum	= testnum + "789"
	    testnum += "0"
	    print(testnum)
	    print(testnum.replace('1234567890','0123456789'))
	    print(testnum.rjust(20,'0'))
	    print(testnum.zfill(20))
	    
	    teststr = 'this-message'
	    print(teststr)
	    print(teststr.startswith('this'))
	    print(teststr.split('-'))
==========================================================================
Response:
null

Request ID:
"ebe00f2f-3fda-11e8-b0be-112860d9c610"

Function Logs:
START RequestId: ebe00f2f-3fda-11e8-b0be-112860d9c610 Version: $LATEST
1234567890
0123456789
00000000001234567890
00000000001234567890
this-message
True
['this', 'message']
END RequestId: ebe00f2f-3fda-11e8-b0be-112860d9c610
REPORT RequestId: ebe00f2f-3fda-11e8-b0be-112860d9c610	Duration: 0.83 ms	Billed Duration: 100 ms 	Memory Size: 128 MB	Max Memory Used: 21 MB

数値

def lambda_handler(event, context):
		testint = 100.5
		print(float(testint) + 100)
		
		testcomp = 100 + 5j
		print(testcomp.real)
		print(testcomp.imag)
==========================================================================
Response:
null

Request ID:
"98ecdea0-3fde-11e8-84a6-6331306e40e3"

Function Logs:
START RequestId: 98ecdea0-3fde-11e8-84a6-6331306e40e3 Version: $LATEST
200.5
100.0
5.0
END RequestId: 98ecdea0-3fde-11e8-84a6-6331306e40e3
REPORT RequestId: 98ecdea0-3fde-11e8-84a6-6331306e40e3	Duration: 0.42 ms	Billed Duration: 100 ms 	Memory Size: 128 MB	Max Memory Used: 21 MB

日付・時間

import datetime
import calendar

def lambda_handler(event, context):
		today = datetime.date.today()
		todaydetail = datetime.datetime.today()
		print(today)
		print(todaydetail)
		print(todaydetail + datetime.timedelta(hours=9))
		print(todaydetail.year)
		print(todaydetail.strftime("%Y/%m/%d %H:%M:%S"))
		print(calendar.isleap(2018))
==========================================================================
Response:
null

Request ID:
"cb3365b8-3fdf-11e8-9ef3-f786a1acc5e8"

Function Logs:
START RequestId: cb3365b8-3fdf-11e8-9ef3-f786a1acc5e8 Version: $LATEST
2018-04-14
2018-04-14 12:31:45.698769
2018-04-14 21:31:45.698769
2018
2018/04/14 12:31:45
False
END RequestId: cb3365b8-3fdf-11e8-9ef3-f786a1acc5e8
REPORT RequestId: cb3365b8-3fdf-11e8-9ef3-f786a1acc5e8	Duration: 9.95 ms	Billed Duration: 100 ms 	Memory Size: 128 MB	Max Memory Used: 21 MB

タプル

import datetime

def lambda_handler(event, context):
		test_tuple = get_today()
		print(test_tuple)
		print(test_tuple[0])

def get_today():
		today = datetime.datetime.today()
		value = (today.year, today.month, today.day)
		return value
==========================================================================
Response:
null

Request ID:
"2e249bf9-3fe2-11e8-ac44-514731084dd0"

Function Logs:
START RequestId: 2e249bf9-3fe2-11e8-ac44-514731084dd0 Version: $LATEST
(2018, 4, 14)
2018
END RequestId: 2e249bf9-3fe2-11e8-ac44-514731084dd0
REPORT RequestId: 2e249bf9-3fe2-11e8-ac44-514731084dd0	Duration: 28.05 ms	Billed Duration: 100 ms 	Memory Size: 128 MB	Max Memory Used: 21 MB

リスト

def lambda_handler(event, context):
		test_list = ['this','-','is','-','test']
		print(test_list)
		
		for i in test_list:
			print(i)
		
		test_list.append('.')
		print(test_list)
		print(test_list.index('test'))
==========================================================================
Response:
null

Request ID:
"126169e5-3fe3-11e8-8df7-4d4c2b06e81b"

Function Logs:
START RequestId: 126169e5-3fe3-11e8-8df7-4d4c2b06e81b Version: $LATEST
['this', '-', 'is', '-', 'test']
this
-
is
-
test
['this', '-', 'is', '-', 'test', '.']
4
END RequestId: 126169e5-3fe3-11e8-8df7-4d4c2b06e81b
REPORT RequestId: 126169e5-3fe3-11e8-8df7-4d4c2b06e81b	Duration: 0.48 ms	Billed Duration: 100 ms 	Memory Size: 128 MB	Max Memory Used: 21 MB

ディクショナリ

def lambda_handler(event, context):
		test_dict = {'year':'2018','mon':'04','day':'14'}
		for i in test_dict:
			print(i)
			print(test_dict[i])
		
		print(test_dict.get('year','NOT FOUND'))
		print(test_dict.get('years','NOT FOUND'))
		
		print(test_dict.keys())
		print(test_dict.values())
		
		for key,value in test_dict.items():
			print(key,":",value)
==========================================================================
Response:
null

Request ID:
"be57689a-3fe5-11e8-a508-7926ec266421"

Function Logs:
START RequestId: be57689a-3fe5-11e8-a508-7926ec266421 Version: $LATEST
year
2018
mon
04
day
14
2018
NOT FOUND
dict_keys(['year', 'mon', 'day'])
dict_values(['2018', '04', '14'])
year : 2018
mon : 04
day : 14
END RequestId: be57689a-3fe5-11e8-a508-7926ec266421
REPORT RequestId: be57689a-3fe5-11e8-a508-7926ec266421	Duration: 0.58 ms	Billed Duration: 100 ms 	Memory Size: 128 MB	Max Memory Used: 21 MB

セット

def lambda_handler(event, context):
		test_set = {'this','-','is','-','set'}
		print(test_set)
		
		for i in test_set:
			print(i)
		
		test_set.discard('-')
		print(test_set)
		
		test_set_frozon = frozenset({'can','not','add','and','discard'})
		print(test_set_frozon)
==========================================================================
Response:
null

Request ID:
"84c22b12-3fe8-11e8-b96a-af1c8c10d84a"

Function Logs:
START RequestId: 84c22b12-3fe8-11e8-b96a-af1c8c10d84a Version: $LATEST
{'is', 'set', '-', 'this'}
is
set
-
this
{'is', 'set', 'this'}
frozenset({'discard', 'can', 'not', 'add', 'and'})
END RequestId: 84c22b12-3fe8-11e8-b96a-af1c8c10d84a
REPORT RequestId: 84c22b12-3fe8-11e8-b96a-af1c8c10d84a	Duration: 0.43 ms	Billed Duration: 100 ms 	Memory Size: 128 MB	Max Memory Used: 21 MB

スライス

def lambda_handler(event, context):
		test_list = ['this','is','python','slice','set']
		print(test_list[:])
		print(test_list[:4])
		print(test_list[1:])
		print(test_list[::2])
		print(test_list[-1::])
		print(test_list[::-1])
==========================================================================
Response:
null

Request ID:
"1467b80a-3ffc-11e8-8f0b-d9cd7250656b"

Function Logs:
START RequestId: 1467b80a-3ffc-11e8-8f0b-d9cd7250656b Version: $LATEST
['this', 'is', 'python', 'slice', 'set']
['this', 'is', 'python', 'slice']
['is', 'python', 'slice', 'set']
['this', 'python', 'set']
['set']
['set', 'slice', 'python', 'is', 'this']
END RequestId: 1467b80a-3ffc-11e8-8f0b-d9cd7250656b
REPORT RequestId: 1467b80a-3ffc-11e8-8f0b-d9cd7250656b	Duration: 0.40 ms	Billed Duration: 100 ms 	Memory Size: 128 MB	Max Memory Used: 21 MB

インポート

class TestClass:
    def __init__(self):
        print('Create TestClass')
        
    def test_method(self,val):
        print('call test_method')
        print(val)
==========================================================================
import testmod

def lambda_handler(event, context):
		test_class = testmod.TestClass()
		test_class.test_method('1')
==========================================================================
Response:
null

Request ID:
"da5fbad7-3ffe-11e8-99e4-f124716fdbac"

Function Logs:
START RequestId: da5fbad7-3ffe-11e8-99e4-f124716fdbac Version: $LATEST
Create TestClass
call test_method
1
END RequestId: da5fbad7-3ffe-11e8-99e4-f124716fdbac
REPORT RequestId: da5fbad7-3ffe-11e8-99e4-f124716fdbac	Duration: 0.34 ms	Billed Duration: 100 ms 	Memory Size: 128 MB	Max Memory Used: 21 MB

コマンドライン引数
Labmdaではeventを利用する。

def lambda_handler(event, context):
		print(event)
		print(event['msg'])
==========================================================================
Response:
null

Request ID:
"bd98380a-3fff-11e8-b8af-798937c861d6"

Function Logs:
START RequestId: bd98380a-3fff-11e8-b8af-798937c861d6 Version: $LATEST
{'msg': 'Hello World'}
Hello World
END RequestId: bd98380a-3fff-11e8-b8af-798937c861d6
REPORT RequestId: bd98380a-3fff-11e8-b8af-798937c861d6	Duration: 0.38 ms	Billed Duration: 100 ms 	Memory Size: 128 MB	Max Memory Used: 21 MB

パスの結合・連結

import os

def lambda_handler(event, context):
		directory = "/etc/python"
		file = "setting.ini"
		print(os.path.join(directory,file))
		print(os.path.join(directory,"3.6",file))
==========================================================================
Response:
null

Request ID:
"9176f4fd-4000-11e8-aa7d-f996117ce1ed"

Function Logs:
START RequestId: 9176f4fd-4000-11e8-aa7d-f996117ce1ed Version: $LATEST
/etc/python/setting.ini
/etc/python/3.6/setting.ini
END RequestId: 9176f4fd-4000-11e8-aa7d-f996117ce1ed
REPORT RequestId: 9176f4fd-4000-11e8-aa7d-f996117ce1ed	Duration: 0.35 ms	Billed Duration: 100 ms 	Memory Size: 128 MB	Max Memory Used: 21 MB

if文

def lambda_handler(event, context):
		value = 1
		if value == 1:
			print("value is 1")
		elif value == 2:
			print("value is 2")
		elif value == 3:
			pass
		else:
			print("value is not 1,2,3")
==========================================================================
Response:
null

Request ID:
"7c158508-4001-11e8-90fc-11102c6f7f98"

Function Logs:
START RequestId: 7c158508-4001-11e8-90fc-11102c6f7f98 Version: $LATEST
value is 1
END RequestId: 7c158508-4001-11e8-90fc-11102c6f7f98
REPORT RequestId: 7c158508-4001-11e8-90fc-11102c6f7f98	Duration: 0.39 ms	Billed Duration: 100 ms 	Memory Size: 128 MB	Max Memory Used: 21 MB

while文

def lambda_handler(event, context):
		counter = 0
		while counter < 10:
			counter += 1
			print(counter)
		
		# タイムアウトになるまで実行されてエラーメッセージが出力された
		while True:
			print("test")
==========================================================================
Response:
{
  "errorMessage": "2018-04-14T16:39:04.666Z 460c8d7e-4002-11e8-80d8-d3914a20416b Task timed out after 30.01 seconds"
}

Request ID:
"460c8d7e-4002-11e8-80d8-d3914a20416b"

Function Logs:

test
....

continue

def lambda_handler(event, context):
	for num in range(100):
		if num % 10:
			continue
		
		print(num)
==========================================================================
Response:
null

Request ID:
"1504b6c1-4003-11e8-a3ab-67ba43bfb4bb"

Function Logs:
START RequestId: 1504b6c1-4003-11e8-a3ab-67ba43bfb4bb Version: $LATEST
0
10
20
30
40
50
60
70
80
90
END RequestId: 1504b6c1-4003-11e8-a3ab-67ba43bfb4bb
REPORT RequestId: 1504b6c1-4003-11e8-a3ab-67ba43bfb4bb	Duration: 0.40 ms	Billed Duration: 100 ms 	Memory Size: 128 MB	Max Memory Used: 22 MB

例外処理

import sys
import traceback

def lambda_handler(event, context):
	
	def except_test(value1,value2):
		result = 0
		try:
			result = value1 + value2
		except:
			print("計算できません")
			raise
		finally:
			print("計算終了")
	
		return result
	
	print(except_test(200,100))
	
	try:
		print(except_test(200,'100'))
	except:
		print("Error")
==========================================================================
Response:
null

Request ID:
"deb4f5cb-4007-11e8-8bc4-fde8b1a9daf5"

Function Logs:
START RequestId: deb4f5cb-4007-11e8-8bc4-fde8b1a9daf5 Version: $LATEST
計算終了
300
計算できません
計算終了
Error
END RequestId: deb4f5cb-4007-11e8-8bc4-fde8b1a9daf5
REPORT RequestId: deb4f5cb-4007-11e8-8bc4-fde8b1a9daf5	Duration: 0.31 ms	Billed Duration: 100 ms 	Memory Size: 128 MB	Max Memory Used: 21 MB