One 、for loop

# 1.for loop 
# list 
L1=[10,20,'ABC','python']
print(L1[0])
for i in L1:
print(i)

10
10
20
ABC
python

#range function , Generate a sequence 
for i in range(10): #10 representative stop , Can't get 
print(i,end=' ')

0 1 2 3 4 5 6 7 8 9

for i in range(5,10): # 5 representative start,10 representative stop
print(i,end=" ")

5 6 7 8 9

# 5 representative start,10 representative stop,2 representative sep
for i in range(5,10,2):
print(i)

5
7
9

# Calculation 1+2+...+100
# Writing a 
sum=0
for i in range(1,101,1):
sum=sum+i
print("1 To 100 The sum of the ：",sum)

1 To 100 The sum of the ： 5050

# Calculation 1+2+...+100
# Write two ：
sum=0
for i in range(101):
sum+=i
print("1 To 100 The sum of the ：",sum)

1 To 100 The sum of the ： 5050

Two 、while loop

#2.while loop 
# Calculation 1+2+...+100
i=1;
sum=0
while i<=100:
sum=sum+i
i=i+1
print("1 To 100 The sum of the ：",sum)

1 To 100 The sum of the ： 5050