﻿ Python: Move spaces to the front of a given string - w3resource

Python: Move spaces to the front of a given string

Python String: Exercise-58 with Solution

Write a Python program to move spaces to the front of a given string.

Sample Solution:-

Python Code:

``````def move_Spaces_front(str1):
noSpaces_char = [ch for ch in str1 if ch!=' ']
spaces_char = len(str1) - len(noSpaces_char)
result = ' '*spaces_char
result = '"'+result + ''.join(noSpaces_char)+'"'
return(result)

print(move_Spaces_front("w3resource .  com  "))
print(move_Spaces_front("   w3resource.com  "))
```
```

Sample Output:

```"     w3resource.com"
"     w3resource.com"
```

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Python: Tips of the Day

Check if a given key already exists in a dictionary:

In is the intended way to test for the existence of a key in a dict.

```d = {"key1": 10, "key2": 23}

if "key1" in d:
print("this will execute")

if "nonexistent key" in d:
print("this will not")
```

If you wanted a default, you can always use dict.get():

```d = dict()

for i in range(100):
key = i % 10
d[key] = d.get(key, 0) + 1
```

and if you wanted to always ensure a default value for any key you can either use dict.setdefault() repeatedly or defaultdict from the collections module, like so:

```from collections import defaultdict

d = defaultdict(int)

for i in range(100):
d[i % 10] += 1
```

but in general, the in keyword is the best way to do it.

Ref: https://bit.ly/2XPMRyz