2 Apr 2026 Class 3
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name = "john"
age = 10
# 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))
# case 2 convert data to str
#print("Name : " + name +", Age : " + str(age))
# case 3 str.format()
#print("Name : {}, Age : {}, Name again : {}".format(name, age, name))
# case 4 named arguments
#print("Name : {n}, Age : {a}, Name again : {n}".format(n=name, a=age))
# eg.
#print("Double {x}: {x} + {x} = {sum_x}".format(x=5, sum_x = 5 + 5))
# case 5 : f-string python > 3.6
#print(f"Name : {name}, Age : {age}, Name again : {name}")
#x = 5
#sum_x = 5+5
#print(f"Double {5}: {5} + {5} = {5+5}")
#print(f"Double {x}: {x} + {x} = {sum_x}")
#format numbers
#price = 49.99
#tax = 0.08
#total = price * (1 + tax)
#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}")
#1---5----01---5----0
#Name Age
#john 10
# Apple
#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
# scu firnat
#print(f"{42:5e}") # value in e format
#print(f"{42:5E}") # value in E format
#print(f"{13.14564567:.5g}") # 5 sig figure
#print(f"{11113.14564567:.5g}") # 5 sig figure
#print(f"{1113.14564567:.5g}") # 5 sig figure
#print(f"{111113.14564567:.5g}") # 5 sig figure
#print(f"{111113.14564567:.5G}") # 5 sig figure
#print(f"{0.14122143:.5%}") # 5 sig figure
#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)
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])
print(name[4][0])
name[0] = ["david", 20]
name[4][0]= 'goodman'
print(name)
del name[1]
print(name)
Python
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