from __future__ import print_function
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How to reverse a string in Python?
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data = "aha"
print(data)
revdata = ''.join(reversed(data))
print(revdata)
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Regex to parse value(that starts with 'hdfs')
for Keyword 'Location'
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def Get_location(data):
import re
result = re.match('.*Location.*(hdfs:.*)', data)
if result:
parsed = result.group(1)
return parsed
else:
return None
print(Get_location("Location hdfs://someserver/home/someuser/"))
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Split using Regex
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import re
data = "This is a#data"
result = re.split("[ #]", data)
print(result)
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How to print Directory Content?
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from __future__ import print_function
def Print_dir(path):
import os
for child in os.listdir(path):
#print("child -> ", child)
absPath = os.path.join(path, child)
if os.path.isdir(absPath):
Print_dir(absPath)
else:
print("absPath -> ", absPath)
Print_dir("./")
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List Operations in Python
(There is no Array ni Python or...)
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data = []
# Assign value of 1, 2, 3 & 4
data = range(1, 5)
print(data)
# Assign heterogeneous types
data = [1, "hello", 2.3]
print(data)
# Sort an List
data = [5, 3, 2, 9]
result = sorted(data)
print(result)
data = ['d', 'a', 'x', 'w', 'z']
result = sorted(data)
print(result)
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'List' comprehension example
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# A list of even numbers b/w 1 to 10
even = [x for x in range(1, 11) if x % 2 == 0]
print(even)
# Litte bit more complex
data = [x for x in range(1, 3) for y in range(3, 5)]
print(data)
[1, 1, 2, 2]
data = [x * y for x in range(1, 3) for y in range(3, 5)]
print(data)
[3, 4, 6, 8]
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'Dictionary' example
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data = {}
data['a'] = "val1"
data['b'] = "val2"
print(data)
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Load yaml file
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import yaml
import os
from __future__ import print_function
def Load_yaml(yamlfile):
if os.path.exists(yamlfile):
with open(yamlfile, 'rt') as fin:
content = yaml.load(fin.read())
print("content -> ", content)
else:
print("Logging config file not available : ", \
yamlfile)
Load_yaml("test.yaml")
content -> key1:val1 key2:val2