Adds Python tips

python.md

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+# PYTHON
+
+## Get variable name as a string:
+
+```Python
+blah = 1
+blah_name = [ k for k , v in locals (). iteritems () if v is blah ][ 0 ]
+```
+
+ WARNING : Not very clever however, as variables in Python may have more that one name ! Use with caution!
+
+## Replace a part of a table [Numpy]:
+
+```Python
+small_BW=where((L[temp[ptr-1]]==ptr),1,0)
+a=BW[posi_0:posi_1,posi_2:posi_3]
+a[:,:]=small_BW.copy()
+```
+
+## Reshape table without size information:
+
+Put -1 as second argument, the info will automatically be processed.
+
+```Python
+array.reshape(3,-1)
+```
+
+## Concatenate 2 tables [Numpy]:
+
+```Python
+c=numpy.concatenate((a,b),axis=0)
+```
+
+## Cast data in table to int:
+
+```Python
+Ndarray.astype(int)
+```
+
+## Write in the end of a file :
+
+Use add mode :
+
+```Python
+file.open(file_name, 'a')
+```
+
+## Test if variable exists:
+
+```Python
+try:
+    print variable
+except NameError:
+    print "Error!"
+```
+
+## Check if variable is one of several choices:
+
+```Python
+if a in [b, c,d]:
+    blabla
+```
+
+## Multi instanciation in Python:
+
+```Python
+a = b = c = 1+1
+```
+
+__**WARNING:** Those three variables are the same object!__
+
+## Print function name :
+
+```Python
+import sys
+
+def tutut():
+    """
+    Dum function displaying its name!
+    """
+    print sys._getframe().f_code.co_name
+
+if __name__ == '__main__':
+    tutut()
+```
+
+And here is the result
+
+```Bash
+$ python tutut.py
+tutut
+```