def password(x):
  """
  Python HW2: Pt. 1, Password
  Andrew Noah Woodlee
  ENG 101-06
  Due Date: 12-3-19
  
  password(x)
  Creates a username and password if both are not in database or certain conditions are met.
  """
  import csv as c
  Passrow=[]
  UNamerow=[]
  if x==True:
    uiUName=input("Choose a username: ")
    lenUIUname=len(uiUName)
    if lenUIUname<6 or lenUIUname>16:
      print("Input must be between 6 and 16.")
      return False
    else:
      with open('userpass.csv', newline="") as userpass:
        ruiName=c.reader(userpass,delimiter=',')
        for row in ruiName:
          UNmamestr=str(uiUName)
          if UNmamestr==row[0]:
            print("Username already taken; pick another.")
            return False
    uiPassword=input("Choose a password: ")
    lenUIPasswd=len(uiPassword)
    with open('userpass.csv', newline='') as passstr:
      rUIpasswd=c.reader(passstr,delimiter=',')
      for PRow in rUIpasswd:
        uiPasswdStr=str(uiPassword)
        if uiPasswdStr==PRow[1]:
          print('Error, password not valid.')
          return False
    if lenUIPasswd<6 or lenUIPasswd>16:
      print("Password input must be between 6 and 16.")
      return False
    else:
      lowercheck=False
      uppercheck=False
      numck=False
      specialchr=False
      nochr=False
      special = [126,33,64,35,36,37,94,38,42,60,62]
      for i in uiPassword:
        if ord(i) in range(97,122):
          lowercheck = True
        elif ord(i) in range(64,91):
            uppercheck=True          
        elif ord(i) in range(48,57):
            numchk=True
        elif ord(i) in special:
          specialchr=True
      if not lowercheck:
        print("You did not include at least one lowercase letter.")
        return False
      if not uppercheck:
        print("You did not include at least one uppercase letter.")
        return False
      if not numchk:
        print("You did not include a number.")
        return False
      if not specialchr:
        print("You did not include a special character.")
        return False
      else:
        with open("userpass.csv",'a',newline='') as UPassA:
          WUnamePass = c.writer(UPassA, delimiter=',')
          UNamePWData=[uiUName,uiPassword]
          WUnamePass.writerow(UNamePWData)
          return True
    
  if x==False:
    uiUName=input("Choose a username: ")
    with open('userpass.csv', newline="") as userpass:
      ruiName=c.reader(userpass,delimiter=',')
      for UNrow in ruiName:
        if uiUName==UNrow[0]:
          uiNameck=True
        else:
          print("Username not found.")
          return False
    uiPassword=input("Choose a password: ")
    with open('userpass.csv', newline='') as passstr:
      rUIpasswd=c.reader(passstr,delimiter=',')
      for PWckrow in rUIpasswd:
        if uiPassword==PWckrow[1] and uiNameck:
          return True
        else:
          print("Password not found.")
          return False
    

def grocery_cost(x):
  """Andrew Noah Woodlee
    

  """
  

def prime(n):
  """
  Andrew Noah Woodlee
  ENG 101-06
  Hw2 Python Prime

  Prime(n)
  Finds nth prime number in range(0,n)
  """
  if n<1:
    return 0
  n=int(n)
  if n==1:
    return 2
  count = 1
  num = 1
  while(count < n):
    num +=2
    if is_prime(num):
      count +=1
    return num
def is_prime(num):
    factor = 2
    while (factor * factor <= num):
        if num % factor == 0:
             return False
        factor +=1
    return True



def IO(in_f,out_f):
  """
  Python HW2, IO assignment
  Andrew Noah Woodlee
  ENG 101-06
  Due Date: 11-14-19

  IO(in_f,out_f)
  Input:
  in_f is the input filename
  out_f is the output filename

  Function reads data in input file and asks for number of points to average and outputs to output file.
  """

  import csv as c
  C=[]
  try:
      # Try to open file
    with open(in_f, newline='') as In_file:
      Data = c.reader(In_file, delimiter=",")
      data = list(Data)
      p = len(data)
      del data
  except FileNotFoundError: # Error for file not found
    print('Could not find file!')
  for i in range(0,p):
    C.append([p])
  with open(in_f,newline='') as in_f2:
    rf=c.reader(in_f2 , delimiter="*")
    Header=True
    for rowdata in rf:
      if Header:
        Head_Data=rowdata
        Header=False
      else:
        for i in range(0,p):
          C[i].append(float(rowdata[i]))
  while True:
    uiDataPts=input("How many points do you want me to average: ")
    try:
      uiDataPts=int(uiDataPts)
      if uiDataPts < 0:
        print("Input must be a positve integer, try again.")
        continue
      break
    except ValueError:
      print("Input must be an integer!")
  OData=[]
  """
  with open(out_f, 'w', newline='') as outf:
    OData=c.writer(outf, delimiter=",")
    OData.writerow(Head_Data)
    L=len(C[0])
    rout=[]
    n=int(L/uiDataPts)
    for i in range(0,n):
      avg=[0.0 for r in range(0,p)]
      for j in range(0,uiDataPts):
        for k in range(0,p):
          avg[k]+=C[k][i*uiDataPts+j]
      for k in range(0,p):
        avg[k]/=uiDataPts
        rout.append[str(avg[k])
    OData.writerow(rout)"""