diff --git a/sio2/sisr/20-python/Exercice1 b/sio2/sisr/20-python/Exercice1
new file mode 100755
index 0000000..e8ca523
--- /dev/null
+++ b/sio2/sisr/20-python/Exercice1
@@ -0,0 +1,4 @@
+#!/usr/bin/python3
+rayon = input('donnez la valeur du rayon : ')
+perimetre = 2 * 3.141592 * int(rayon)
+print (perimetre, " cm ")
diff --git a/sio2/sisr/20-python/Exercice2 b/sio2/sisr/20-python/Exercice2
new file mode 100755
index 0000000..95249ba
--- /dev/null
+++ b/sio2/sisr/20-python/Exercice2
@@ -0,0 +1,18 @@
+#!/usr/bin/python3
+tableau = []
+for i in range(3)
+	entier = int(input('chiffre : '))
+	tableau.append(entier)
+
+moy= sum(tableau)/len(tableau)
+
+def maximum(tableau):
+	vmax = tableau[0]
+
+
+
+
+def minimum(tableau):
+	vmax = tableau[0]
+
+
diff --git a/sio2/sisr/20-python/Exercice3 b/sio2/sisr/20-python/Exercice3
new file mode 100755
index 0000000..c2e715b
--- /dev/null
+++ b/sio2/sisr/20-python/Exercice3
@@ -0,0 +1,13 @@
+#!/usr/bin/python3
+phrase = input ("Phrase : ")
+tabmot = phrase.split(' ')
+cptmot = {}
+for mot in tabmot :
+	if mot in tabmot:
+		cptmot [mot]=cptmot[mot] +1
+	else:
+		cptmot[mot]=1
+for key in cptmot.keys():
+	print (key, " ",cptmot[key])
+
+
diff --git a/sio2/sisr/20-python/creatusr.py b/sio2/sisr/20-python/creatusr.py
new file mode 100644
index 0000000..66d3a4e
--- /dev/null
+++ b/sio2/sisr/20-python/creatusr.py
@@ -0,0 +1,26 @@
+#!/usr/bin/python3
+
+import sys
+nbarg = len(sys.arg)
+
+if nbarg !=2
+	print ("Nombre d'arguments invalides")
+	exit (1)
+filename = sys.arg[1]
+
+try:
+    fh = open("user.txt", "r")
+except:
+    print ("Fichier user.txt inconnu")
+else:
+    line = fh.readline ()
+    while line:
+	nouvline = line.rstrip()
+	login.nomlong = nouvline.split(':')
+	print (nbarg)
+	#useradd (login)
+        line = fh.readline()
+
+    fh.close()
+
+
diff --git a/sio2/sisr/20-python/user.txt b/sio2/sisr/20-python/user.txt
new file mode 100644
index 0000000..9d4e71d
--- /dev/null
+++ b/sio2/sisr/20-python/user.txt
@@ -0,0 +1,3 @@
+jdaniel      : Jack Daniel
+wpeel        : William Peel
+ngraphaneaud : Noe Graphaneaud