def checknum(passnum): try: a = float(passnum) return True, a except TypeError as msg: print(msg) except Exception as e: print(e) return False, None def checkop(passop): if passop in ('+', '-', '*', '/'): return True else: print("wrong operator !") return False def calc(x, y, z): if checknum(x)[0] and checknum(y)[0] and checkop(z): if z == '+': result = checknum(x)[1] + checknum(y)[1] return True, result elif z == '-': result = checknum(x)[1] - checknum(y)[1] return True, result elif z == '*': result = checknum(x)[1] * checknum(y)[1] return True, result elif z == '/': if y == 0: print("Cannot divide by zero !") return False, None else: result = checknum(x)[1] / checknum(y)[1] return True, result else: print("Invalid Operator !") return False, None else: print("Invalid Expression !") return False, None print("********************** calc ****************************") InputStr = input("Input Expression : ") l = list(InputStr.split(" ")) print(l) while len(l) >= 3 and len(l) % 2: a = l[0] b = l[2] c = l[1] print (a) print (b) print (c) result = calc(a, b, c)[1] if result != False: del l[:2] l[0] = result else: break print('result : ', result) print("********************** calc ****************************") print("*********************** String Modify ****************************") a = "Abc def" print(a) print('UPPER', a.upper()) print('LOWER', a.lower()) print('TITLE', a.title()) print('CAPITAL', a.capitalize()) print(a) print("*********************** String Modify ****************************") #format numbers price = 49.99 tax = 0.08 name = "john" age = 10 total = price * (1 + tax) print(" ********************* String Handle - Not fstring *********************") # case 1 place holder codes %s string, %d integer %f float %x hex #print("Name : %s, Age : %s" % (name, age)) #print("Name : %s, Age : %d" % (name, age)) #print("Name : %s, Tax : %f" % (name, tax)) # case 2 convert data to str print("Name : " + name +", Age : " + str(age) + ", Name again : " + name +", Tax = " + str(tax)) # case 3 str.format() print("Name : {}, Age : {}, Name again : {}, Tax : {}".format(name, age, name, tax)) # case 4 named arguments print("Name : {n}, Age : {a}, Name again : {n}, Tax : {m}".format(n=name, a=age, m=tax)) # eg. print("Double {x}: {x} + {x} = {sum_x}".format(x=5, sum_x = 5 + 5)) print("********************* String Handle - Not fstring *********************") print("********************* String Handle - fstring *********************") print(f"Price : ${price:.2f} | Tax : {tax:.1%} | Total: ${total:.2f}") ## f"{variable:[fill][align][width][.precision][type]} print(f"{age:5d}") print('1---5----01---5----0') print(f"{'Name':<10}{'Age':>5}") # < left align, > right align ^ center print(f"{name:$<10}{age:->5.2f}") print(f"{name:<10}{age:->5.2f}") print(f"{name:<10}{age:->5d}") print(f"{name:<10}{age:->10.2f}") print(f"{name:<<10s}{age:->10.2f}{' ':$<10}") print(f"{'Apple':^10}") print(f"{42:05}") print(f"{42:0<5}") print(f"{1234567:,}") #print(f"{42:5b}") # binary value #print(f"{42:5o}") # octal value #print(f"{42:5x}") # hex value print("*********************** String Handle - fstring ****************************") print("*********************** Truthy value or falsy value ****************************") #print(True, False, type(True)) #print(False == 0) #x = True and 2 and [1] and {0} and -1.0 and "hello" # truthy value #print(x) #y = False or 0 or [] or {} or None or 0.00 or ' ' # falsy value #print(y) #print(print(" ")) #========================================== default_city = 'kw' city = '' city = city or print("please input city") or default_city print(city) print("*********************** Truthy value or falsy value ****************************") print('**************** for *************************') for i in range(6): if i == 4: break for j in range(5): print(i,j) print('**************** for *************************') print('**************** while *************************') x = 5 while x > 0: #while True: print(x) if x == 4: x = x - 1 continue print("hello") if x == 3: break x = x - 1 else: print("normal exit of while") print("after while") i = 6 try: while i > -1: if i == 3: raise print(i) i = i - 1 except ValueError: print('Divide By Zero Error') except: print("I stop the program") print('**************** while *************************') print('******* list *********') a = [1,2,3] a[0] = 9 a.append(4) print(a) a.insert(2, 5) print(a) c = a[::] d = a.copy() print(c) print(d) del a[0] print (a) a.remove(2) print (a) print(1 in a) print('count 4 and index 4', a.count(4), a.index(4)) a.sort(reverse=True) # change original list print(a) b = sorted(a, reverse=False) print(a) print(b) name = ["john", "ann", "mary", "peter", ["ryan", 1], 2, 3, [True, 0,0,9, "hello"]] print(name, id(name), type(name)) print(name[0], name[4]) a = [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16] print(a[10], a[-4]) b=slice(0,7,1) # start, end-1, step print(type(b)) print(a[b], a[0:7:1]) print(a[b], a[0:15:7]) print(a[-1:0:-4]) print(a[15:0:-4]) print('******* list *********') print('******* tuple *********') a = (1,2,3) b = list(a) print(b) b.append(4) b = tuple(b) print(b) c = b[::] print(c) print(1 in a) e = sorted(b,reverse=True) print('tuple a - original sort : ', b) print('list b - after sort with reverse true : ', e) print('******* tuple *********') print('******* set *********') a = {1,2,3} print(a) a.add(4) print(a) a.update({5,6}) print(a) b = a.copy() print(b) print(1 in a) d = {"name" : "john", "age": 10, "gender" : "male" } del d["gender"] print(d) d["name"] = "peter" print(d) d["mame"] = "prince building" print(d) print(d.keys()) for i in d.keys(): print(i) print(d.values()) print(d.items()) test1 = [{'name':'peter', 'age':11}, {'name':'john','age':12}] print(test1[1].get('name')) print(test1[1].get('age')) print('******* set *********') print("********************** ANOTHER ****************************") print(len("1234 ")) print(f"{checknum('2')[1]:<20.2f}".strip() + ' abc') a = {1,2,3} b = {4,2,3} c = a | b c = a.union(b) d = a & b d = a.intersection(b) e = a - b e = a.difference(b) f = a ^ b print (c) print (d) print (e) print (f) a = '1234567' print(list(a)) print({*a}) #unordered set b = [*a] print(b) # Check Function call print("*************************** Funciton call***************************") def a(x,y,z=1): result = x + y + z print(f"function a result : {result}") print("x:",x," y:",y," z:",z) print(f"x: {x}, y: {y}, z: {z}") return result print(a(1,2)) result = a(y=4,z=5,x=6) + a(7,8,9) print(result) #print(globals()) x = 1 def a(): print("hello a") a() # case 1 import module as label import dio as d import dio as c print("aaaaaaaaaaaaaa") d.a() c.a() d.a() print("aaaaaaaaaaaaaa") print(x+ d.x + d._x) # case 2 from module import * from dio import * # x = 11 def a() a() print(x, x_y) #print(_x) #print(globals()) # case 3 from module import selected items from tria import a, _x a() print(_x, x) from math import pi, sqrt print(pi, sqrt(9)) from math import pi x = 1 # global variable def a(): #global x x = 2 #x = x + 10 # local variable #print(x) print(type(x)) a() print(x) print(pi) print("*************************** Funciton call***************************")