Hi,

can anyone help me with the below code I am some wearied output..don' know 
what exactly to do...
Also, can someone tell me that how to load an image collection like 
ImageCollection('?(asking about this)') and from the image collection how 
to know which image is where with name.
I am working on linux and using python.


import ee
ee.Initialize()
"""landsat5Toa = 
ee.ImageCollection('LC80150062013111LGN01').filterDate('2014-3-25').select('B[1]')"""

img = ee.Image('LC80150062013111LGN01').select('B1').unitScale(0, 255)

meanReducer = ee.Reducer.mean()
sigmaReducer = ee.Reducer.stdDev()
region = ee.Geometry.Rectangle(77.00133,-51.30404,74.69582,-41.38993 )
scale = 10000
mean = img.reduceRegion(meanReducer, region, scale)
sigma = img.reduceRegion(sigmaReducer, region, scale)
"""mean = landsat5Toa.get('bands')"""


 
def stretch(img, mean, sigma):

  return ee.Image(0).expression(


  '((img - mean) / (sigma * 3)) + 0.5',  {
  'img': img, 
  'mean': ee.Image.constant(mean),
  'sigma': ee.Image.constant(sigma)
  })

print(mean.getInfo())
print(sigma.getInfo())








Output

{u'B1': None}
{u'B1': None}



I dont know where I am haveing a problem.

Thank You 

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