diff --git a/challenges146_150/challenge-146_.py b/challenges146_150/challenge-146_.py
new file mode 100644
index 0000000..4152396
--- /dev/null
+++ b/challenges146_150/challenge-146_.py
@@ -0,0 +1,57 @@
+alphabet=["a", "b", "c", "d", "e", "f", "g", "h", "i", 
+"j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", 
+"u", "v", "w", "x", "y", "z", " "]
+
+def get_data():
+    word=input("Enter your message: ")
+    word=word.lower()
+    num=int(input("Enter a number (1-26): "))
+    while num>26 or num==0:
+        num=int(input("Out of range, Please enter a number (1-26): "))
+    data=(word,num)
+    return(data)
+
+def make_code(word,num):
+    new_word=""
+    for x in word:
+        y=alphabet.index(x)
+        y=y+num
+        if y>26:
+            y=y-27
+        char=alphabet[y]
+        new_word=new_word +char
+    print(new_word)
+    print()
+
+def decode(word,num):
+    new_word=""
+    for x in word:
+        y=alphabet.index(x)
+        y=y-num
+        if y<0:
+            y=y+27
+        char=alphabet[y]
+        new_word=new_word +char
+    print(new_word)
+    print()
+
+def main():
+    again=True
+    while again==True:
+        print("1) Make a code")
+        print("2) Decode a message")
+        print("3) Quit")
+        print()
+        selection=int(input("Enter your selection: "))
+        if selection==1:
+            (word,num)=get_data()
+            make_code(word,num)
+        elif selection==2:
+            (word,num)=get_data()
+            decode(word,num)
+        elif selection==3:
+            again=False
+        else:
+            print("Incorrect selection")
+
+main()
diff --git a/challenges146_150/challenge-147_.py b/challenges146_150/challenge-147_.py
new file mode 100644
index 0000000..8d787ce
--- /dev/null
+++ b/challenges146_150/challenge-147_.py
@@ -0,0 +1,92 @@
+import random
+
+def select_col():
+    colours=["r", "b", "o", "y", "p", "g", "w"]
+    c1=random.choice(colours)
+    c2=random.choice(colours)
+    c3=random.choice(colours)
+    c4=random.choice(colours)
+    data=(c1, c2, c3, c4)
+    return data
+
+def tryit(c1, c2, c3, c4):
+    print("The colours are: (r)ed, (b)lue, (o)range, (y)ellow, (p)ink, (g)reen, (w)hite")
+    try_again=True
+    while try_again==True:
+        u1=input("Enter your choice for place 1: ")
+        u1=u1.lower()
+        if u1 !="r" and u1 !="b" and u1 !="o" and u1 !="y" and u1 !="p" and u1 !="g" and u1 !="w":
+            print("Incorrect selection")
+        else:
+            try_again=False
+
+    try_again=True
+    while try_again==True:
+        u2=input("Enter your choice for place 2: ")
+        u2=u2.lower()
+        if u2 !="r" and u2 !="b" and u2 !="o" and u2 !="y" and u2 !="p" and u2 !="g" and u2 !="w":
+            print("Incorrect selection")
+        else:
+            try_again=False
+
+    try_again=True
+    while try_again==True:
+        u3=input("Enter your choice for place 3: ")
+        u3=u3.lower()
+        if u3 !="r" and u3 !="b" and u3 !="o" and u3 !="y" and u3 !="p" and u3 !="g" and u3 !="w":
+            print("Incorrect selection")
+        else:
+            try_again=False
+
+    try_again=True
+    while try_again==True:
+        u4=input("Enter your choice for place 4: ")
+        u4=u4.lower()
+        if u4 !="r" and u4 !="b" and u4 !="o" and u4 !="y" and u4 !="p" and u4 !="g" and u4 !="w":
+            print("Incorrect selection")
+        else:
+            try_again=False
+    
+    correct=0
+    wrong_place=0
+
+    if c1==u1:
+        correct=correct+1
+    elif c1==u2 or c1==u3 or c1==u4:
+        wrong_place=wrong_place+1
+
+    if c2==u2:
+        correct=correct+1
+    elif c2==u1 or c2==u3 or c2==u4:
+        wrong_place=wrong_place+1
+
+    if c3==u3:
+        correct=correct+1
+    elif c3==u1 or c3==u2 or c3==u4:
+        wrong_place=wrong_place+1
+
+    if c4==u4:
+        correct=correct+1
+    elif c4==u1 or c4==u2 or c4==u3:
+        wrong_place=wrong_place+1
+
+    print("Correct colour in the correct place: ", correct)
+    print("Correct colour but in the wrong place: ", wrong_place)
+    print()
+
+    data2=(correct, wrong_place)
+    return data2
+
+def main():
+    (c1, c2, c3, c4) = select_col()
+    score = 0
+    play = True
+    while play == True:
+        (correct, wrong_place) = tryit(c1, c2, c3, c4)
+        score=score+1
+        if correct==4:
+            play=False
+    print("You win!")
+    print("You took", score, "guesses")
+
+main()
\ No newline at end of file
diff --git a/challenges146_150/challenge-148_.py b/challenges146_150/challenge-148_.py
new file mode 100644
index 0000000..593dde4
--- /dev/null
+++ b/challenges146_150/challenge-148_.py
@@ -0,0 +1,144 @@
+import csv
+
+def get_data():
+    file=list(csv.reader(open("passwords.csv")))
+    tmp=[]
+    for x in file:
+        tmp.append(x)
+    return tmp
+
+def create_userID(tmp):
+    name_again=True
+    while name_again==True:
+        userID=input("Enter a new user ID: ")
+        userID.lower()
+        inlist=False
+        row=0
+        for y in tmp:
+            if userID in tmp[row][0]:
+                print(userID, "has already been allocated")
+                inlist=True
+            row=row+1
+        if inlist==False:
+            name_again=False
+    return userID
+
+def create_password():
+    sclist=["!", "@", "#", "$", "%", "^", "&", "*", "(", ")", "?"]
+    nclist=["1", "2", "3", "4", "5", "6", "7", "8", "9", "0"]
+    tryagain=True
+    while tryagain==True:
+        score=0
+        uc=False
+        lc=False
+        sc=False
+        nc=False
+        password=input("Enter Password: ")
+        password2=input("Enter password again: ")
+        length=len(password)
+        if length>=8:
+            score=score+1
+        for x in password:
+            if x.islower():
+                lc=True
+            if x.isupper():
+                uc=True
+            if x in sclist:
+                sc=True
+            if x in nclist:
+                ns=True
+
+        if sc==True:
+            score=score+1
+        if lc==True:
+            score=score+1
+        if uc==True:
+            score=score+1
+        if nc==True:
+            score=score+1
+
+        if score==1 or score==2:
+            print("This is a weak password. Try again.")
+
+        if score==3 or score==4:
+            print("This password could be improved. ")
+            again=input("Do you want to try for a stronger password? (y/n) ")
+            again.lower()
+            if again=="n":
+                tryagain=False
+
+        if password != password2:
+            print("Password do not match. File not saved")
+            main()
+        else:
+            return password
+
+def find_userID(tmp):
+    ask_name_again=True 
+    userID=""
+    while ask_name_again == True:
+        searchID=input("Enter the user ID you are looking for ")
+        searchID.lower()
+        inlist=False
+        row=0
+        for y in tmp:
+            if searchID in tmp[row][0]:
+                inlist=True
+            row=row+1
+        if inlist==True:
+            userID=searchID
+            ask_name_again=False
+        else:
+            print(searchID, "is NOT in the list")
+    return userID
+
+def change_password(userID,tmp):
+    if userID!="":
+        password=create_password()
+        ID=userID.index(userID)
+        tmp(ID)[1]=password
+        file=open("passwords.csv", "w")
+        x=0
+        for row in tmp:
+            newrecord=tmp[x][0] + "," +tmp[x][1] + "\n"
+            file.write(newrecord)
+            x=x+1
+        file.close()
+
+def display_all_userID():
+    tmp=get_data()
+    x=0
+    for row in tmp:
+        print(tmp[x][0])
+        x=x+1
+
+def main():
+    tmp=get_data()
+    go_again=True
+    while go_again==True:
+        print()
+        print("1) Create a new User ID")
+        print("2) Change a password")
+        print("3) Display all User IDs")
+        print("4) Quit")
+        print()
+
+        selection=int(input("Enter Selection: "))
+        if selection==1:
+            userID=create_userID(tmp)
+            password=create_password()
+            file=open("Passwords.csv","a")
+            newrecord=userID+","+password+"\n"
+            file.write(str(newrecord))
+            file.close()
+        elif selection==2:
+            userID=find_userID(tmp)
+            change_password(userID,tmp)
+        elif selection==3:
+            display_all_userID()
+        elif selection==4:
+            go_again=False
+        else:
+            print("Incorrect selection")
+
+main()
\ No newline at end of file
diff --git a/challenges146_150/challenge-149_.py b/challenges146_150/challenge-149_.py
new file mode 100644
index 0000000..0653a10
--- /dev/null
+++ b/challenges146_150/challenge-149_.py
@@ -0,0 +1,38 @@
+from tkinter import *
+
+def show_table():
+    num=int(num_box.get())
+    value=1
+    for i in range (1,13):
+        answer=i*num
+        num_list.insert(END,(i, "x", num, "=", answer))
+        value=value+1
+    num_box.delete(0,END)
+    num_box.focus()
+
+def clear_list():
+    num_box.delete(0,END)
+    num_list.delete(0,END)
+    num_box.focus()
+
+window=Tk()
+window.title=("Times Table")
+window.geometry("400x280")
+
+label1=Label(text="Enter a number: ")
+label1.place(x=20, y=20, width=100, height=25)
+
+num_box=Entry(text=0)
+num_box.place(x=120, y=20, width=100, height=25)
+num_box.focus()
+
+button1=Button(text="View Times Table", command=show_table)
+button1.place(x=250, y=20, width=120, height=25)
+
+num_list=Listbox()
+num_list.place(x=120, y=50, width=100, height=200)
+
+button2=Button(text="Clear", command=clear_list)
+button2.place(x=250, y=50, width=120, height=25)
+
+window.mainloop()
\ No newline at end of file
diff --git a/challenges146_150/challenge-150_.py b/challenges146_150/challenge-150_.py
new file mode 100644
index 0000000..3804ba0
--- /dev/null
+++ b/challenges146_150/challenge-150_.py
@@ -0,0 +1,230 @@
+import sqlite3
+from tkinter import *
+
+with sqlite3.connect("Art.db") as db:
+    cursor=db.cursor()
+
+cursor.execute("""CREATE TABLE IF NOT EXISTS Artists(artistid integer PRIMARY KEY, name text, address text, town text, county text, postcode text);
+""")
+
+cursor.execute("""CREATE TABLE IF NOT EXISTS Art(pieceid integer PRIMARY KEY, artistid integer, title text, medium text, price integer);
+""")
+
+def addartist():
+    newname=artistname.get()
+    newaddress=artistadd.get()
+    newtown=artisttown.get()
+    newcounty=artistcounty.get()
+    newpostcode=artistpostcode.get()
+    cursor.execute("""INSERT INTO Artists(name, address, town, county, postcode) 
+    VALUES (?,?,?,?,?)""",(newname, newaddress, newtown, newcounty, newpostcode))
+    db.commit()
+    artistname.delete(0,END)
+    artistadd.delete(0,END)
+    artisttown.delete(0,END)
+    artistcounty.delete(0,END)
+    artistpostcode.delete(0,END)
+    artistname.focus()
+
+def clearartist():
+    artistname.delete(0,END)
+    artistadd.delete(0,END)
+    artisttown.delete(0,END)
+    artistcounty.delete(0,END)
+    artistpostcode.delete(0,END)
+    artistname.focus()
+
+def addart():
+    newartname=artname.get()
+    newtitle=arttitle.get()
+    newmedium=medium.get()
+    newprice=artprice.get()
+    cursor.execute("""INSERT INTO Art(artistid, title, medium, price) 
+    VALUES (?,?,?,?)""",(newartname, newtitle, newmedium, newprice))
+    db.commit()
+    artname.delete(0,END)
+    arttitle.delete(0,END)
+    medium.set("")
+    artprice.delete(0,END)
+    artistname.focus()
+
+def clearart():
+    artname.delete(0,END)
+    arttitle.delete(0,END)
+    medium.set("")
+    artprice.delete(0,END)
+    artistname.focus()
+
+def clearwindow():
+    outputwindow.delete(0,END)
+
+def viewartists():
+    cursor.execute("SELECT * FROM Artists")
+    for x in cursor.fetchall():
+        newrecord=str(x[0])+","+str(x[1])+","+str(x[2])+","+str(x[3])+","+str(x[4])+","+x[5]+"\n"
+        outputwindow.insert(END,newrecord)
+
+def viewart():
+    cursor.execute("SELECT * FROM Art")
+    for x in cursor.fetchall():
+        newrecord=str(x[0])+","+str(x[1])+","+str(x[2])+","+str(x[3])+","+str(x[4])+"\n"
+        outputwindow.insert(END,newrecord)
+
+def searchartistoutput():
+    selectedartist=searchartist.get()
+    cursor.execute("SELECT name FROM Artists WHERE artistid=?",[selectedartist])
+    for x in cursor.fetchall():
+        outputwindow.insert(END,x)
+        cursor.execute("SELECT * FROM Art WHERE artistid=?",[selectedartist])
+        for x in cursor.fetchall():
+            newrecord=str(x[0])+","+str(x[1])+","+str(x[2])+","+str(x[3])+","+str(x[4])+"\n"
+            outputwindow.insert(END,newrecord)
+    searchartist.delete(0,END)
+    searchartist.focus()
+
+def searchmediumoutput():
+    selectedmedium=medium2.get()
+    cursor.execute("SELECT Art.pieceid, Artists.name, Art.title, Art.medium, Art.price FROM Artists, Art WHERE Artists.artistid=Art.artistid AND Art.medium=?",[selectedmedium])
+    for x in cursor.fetchall():
+        newrecord=str(x[0])+","+str(x[1])+","+str(x[2])+","+str(x[3])+","+str(x[4])+"\n"
+        outputwindow.insert(END,newrecord)
+    medium2.set("")
+
+def searchbyprice():
+    minprice=selectmin.get()
+    maxprice=selectmax.get()
+    cursor.execute("SELECT Art.pieceid, Artists.name, Art.title, Art.medium, Art.price FROM Artists, Art WHERE Artists.artistid=Art.artistid AND Art.price>=? AND Art.price<=?",[minprice,maxprice])
+    for x in cursor.fetchall():
+        newrecord=str(x[0])+","+str(x[1])+","+str(x[2])+","+str(x[3])+","+str(x[4])+"\n"
+        outputwindow.insert(END,newrecord)
+    selectmin.delete(0,END)
+    selectmax.delete(0,END)
+    selectmin.focus()
+
+def sold():
+    file=open("SoldArt.txt","a")
+    selectedpiece=soldpiece.get()
+    cursor.execute("SELECT * FROM Art WHERE pieceid=?",[selectedpiece])
+    for x in cursor.fetchall():
+        newrecord=str(x[0])+","+str(x[1])+","+str(x[2])+","+str(x[3])+","+str(x[4])+"\n"
+        file.write(newrecord)
+    file.close()
+    cursor.execute("DELETE FROM Art WHERE pieceid=?",[selectedpiece])
+    db.commit()
+
+window=Tk()
+window.title("Art")
+window.geometry("1220x600")
+
+title1=Label(text="Enter new details: ")
+title1.place(x=10, y=10, width=100, height=25)
+
+artistnamelbl=Label(text="Name: ")
+artistnamelbl.place(x=30, y=40, width=80, height=25)
+artistname=Entry(text="")
+artistname.place(x=110, y=40, width=200, height=25)
+artistname.focus()
+
+artistaddlbl=Label(text="Address: ")
+artistaddlbl.place(x=310, y=40, width=80, height=25)
+artistadd=Entry(text="")
+artistadd.place(x=390, y=40, width=200, height=25)
+
+artisttownlbl=Label(text="Town: ")
+artisttownlbl.place(x=590, y=40, width=80, height=25)
+artisttown=Entry(text="")
+artisttown.place(x=670, y=40, width=100, height=25)
+
+artistcountylbl=Label(text="County: ")
+artistcountylbl.place(x=770, y=40, width=80, height=25)
+artistcounty=Entry(text="")
+artistcounty.place(x=850, y=40, width=100, height=25)
+
+artistpostcodelbl=Label(text="Postcode: ")
+artistpostcodelbl.place(x=950, y=40, width=80, height=25)
+artistpostcode=Entry(text="")
+artistpostcode.place(x=1030, y=40, width=100, height=25)
+
+addbtn=Button(text="Add Artist", command=addartist)
+addbtn.place(x=110, y=80, width=130, height=25)
+
+clearbtn=Button(text="Clear Artist", command=clearartist)
+clearbtn.place(x=250, y=80, width=130, height=25)
+
+artnamelbl=Label(text="Artist ID: ")
+artnamelbl.place(x=30, y=120, width=80, height=25)
+artname=Entry(text="")
+artname.place(x=110, y=120, width=50, height=25)
+
+arttitlelbl=Label(text="Title: ")
+arttitlelbl.place(x=200, y=120, width=80, height=25)
+arttitle=Entry(text="")
+arttitle.place(x=280, y=120, width=280, height=25)
+
+artmediumlbl=Label(text="Medium: ")
+artmediumlbl.place(x=590, y=120, width=80, height=25)
+
+medium=StringVar(window)
+artmedium=OptionMenu(window, medium, "Oil", "Watercolour", "Ink", "Acrylic")
+artmedium.place(x=670, y=120, width=100, height=25)
+
+artpricelbl=Label(text="Price: ")
+artpricelbl.place(x=770, y=120, width=80, height=25)
+artprice=Entry(text="")
+artprice.place(x=850, y=120, width=100, height=25)
+
+addartbtn=Button(text="Add Piece", command=addart)
+addartbtn.place(x=110, y=150, width=130, height=25)
+
+clearartbtn=Button(text="Clear Piece", command=clearart)
+clearartbtn.place(x=250, y=150, width=130, height=25)
+
+outputwindow=Listbox()
+outputwindow.place(x=10, y=200, width=1000, height=350)
+
+clearoutputwindow=Button(text="Clear output", command=clearwindow)
+clearoutputwindow.place(x=10, y=200, width=1000, height=350)
+
+viewallartists=Button(text="View All Artists", command=viewartists)
+viewallartists.place(x=1020, y=230, width=155, height=25)
+
+viewallart=Button(text="View All Art", command=viewart)
+viewallart.place(x=1020, y=260, width=155, height=25)
+
+searchartist=Entry(text="")
+searchartist.place(x=1020, y=300, width=50, height=25)
+
+searchartistbtn=Button(text="Search by Artist", command=searchartistoutput)
+searchartistbtn.place(x=1075, y=300, width=100, height=25)
+
+medium2=StringVar(window)
+
+searchmedium=OptionMenu(window, medium2, "Oil", "Watercolour", "Ink", "Acrylic")
+searchmedium.place(x=1020, y=330, width=100, height=25)
+
+searchmediumbtn=Button(text="Search", command=searchmediumoutput)
+searchmediumbtn.place(x=1125, y=330, width=50, height=25)
+
+minlbl=Label(text="Min: ")
+minlbl.place(x=1020, y=360, width=75, height=25)
+
+maxlbl=Label(text="Max: ")
+minlbl.place(x=1100, y=360, width=75, height=25)
+
+selectmin=Entry(text="")
+selectmin.place(x=1020, y=380, width=75, height=25)
+
+selectmax=Entry(text="")
+selectmax.place(x=1100, y=380, width=75, height=25)
+
+searchpricebtn=Button(text="Search by Price", command=searchbyprice)
+searchpricebtn.place(x=1020, y=410, width=155, height=25)
+
+soldpiece=Entry(text="")
+soldpiece.place(x=1020, y=450, width=50, height=25)
+
+soldbtn=Button(text="Sold", command=sold)
+soldbtn.place(x=1075, y=450, width=100, height=25)
+
+window.mainloop()
+db.close()
\ No newline at end of file