python session day-t payilagam for迴圈和if條件

for 循環：
for 迴圈用於迭代序列（即列表、元組、字典、集合或字串）。

文法：
對於序列中的變數

範例：

txt = '1234'

for num in txt:
    print(num,end=' ')

output:
1 2 3 4

如果條件：
If 語句的工作原理是檢查表達式以查看是否滿足條件，並根據獲得的輸出傳回一個值。

syntax:
if condition:
      if condition is True
else:
      if condition is False

範例

x=20
if x>=20:
   print(x is within 20)
else :
   print(x is above the limit)

output:
x is within 20

txt = '12a4'

for num in txt:
    if num>='0' and num<='9':
        print(num,end=' ')
    else:
        print('Not Decimal',end=' ')

Output:

1 2 Not Decimal 4
above code is the example of combines if and for.

name = input("請輸入您的名字：")
印刷（姓名）
名稱中的字母：
print(字母表, end='*')

輸出：
R*A*J*A

程式碼檢查每個索引並列印輸出。

name1 = input("Enter the first name: ")
name2 = input("Enter the second name: ")
name3 = input("Enter the third name: ")
name4 = input("Enter the fourth name: ")
name = [name1, name2, name3, name4]


for letter in name:
    if letter[0]=='G':
        print(letter)
    else:
        continue
for alphabet in name:
    if alphabet[-1]=='a':
        print(alphabet)
    else:
        continue
for alpha in name:
    for i in alpha:
        if i==' ':
            print(alpha)
        else:
            continue
for character in name:
    if len(character)>9:
        print(character)
    else:
        continue

output:

Enter the first name: Guhanraja
Enter the second name: Lakshmi Pritha
Enter the third name: Guru Prasanna
Enter the fourth name: Varatharajan
Guhanraja
Guru Prasanna
Guhanraja
Lakshmi Pritha
Guru Prasanna
Lakshmi Pritha
Guru Prasanna
Lakshmi Pritha
Guru Prasanna
Varatharajan

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